Paris Hilton recently told Ryan Seacrest that she's sure her beau Cy Waits will pop the question. And based on a recent shopping adventure, it sounds like Waits could be getting down on one knee sooner than later.

A source tells PEOPLE that Hilton, who just celebrated her 30th birthday, accompanied Waits to luxury jewelry store Jacob & Co. in New York on Friday, where the duo checked out some serious bling.

"They shopped for engagement rings," the source says. "They were really cute together. Paris was making comments about the rings and joking that her ring has to be at least 24 carats."

Although the lovebirds – who began dating last summer – did not leave with an engagement ring, Hilton did not leave empty-handed.

"She walked out sporting a $25,000 white gold and black diamond encrusted ring," the source says.

When reached for comment, Hilton's rep tells PEOPLE, "The couple were shopping in New York looking for something special for Paris's 30th birthday."

As for Hilton, she recently told Seacrest her relationship with nightclub owner Waits is "really serious." "I'm so happy," the heiress said. "I've never been happier."

Credit: PEOPLE (Dahvi Shira)

Kaley Cuoco made a big announcement on the red carpet at Sunday's Golden Globes: The Big Bang Theory star told Ryan Seacrest she was engaged – then she took it back.

After noticing a major sparkler on her ring finger, Seacrest asked the actress if she had any happy news to share.

"I'm engaged," Cuoco, 25, said, pausing as the E! host happily congratulated her. Then, she clarified: "I'd like you to know who I'm engaged to – Chopard, the jewelry designer."

So, why was the Golden Globes presenter wearing the ring on that finger?

"It's the only finger it fit," she said. "And I said, 'I have to wear it!' And [the jewelry designer] said, 'But you can't wear it on that finger.' And I said, 'Oh, I'm wearing it!' "

And what did Cuoco's musician boyfriend Christopher French make of her choice?

"He's like, 'Do you have to wear the ring?' " she said. "I'm like, 'Yeah, I do!' "

Credit: People

The hardest working man in show biz is going to pop the question to his lady love, Radar Online has exclusively learned.

Ryan Seacrest and Julianne Hough have been dating for less than a year, but sources close to the couple have revealed that the American Idol host has already picked out an engagement ring and is preparing to propose.

"Ryan already has the ring -- and it's a rock -- four to five carats," one source confirmed to Radar Online.

"Money was no object for Ryan... expect the Rolls Royce of engagement rings.

"He's had it for awhile and is in the process of planning the engagement. It's going to happen within the next few months or so!"

Seacrest, who met the dancer turned actress early last summer, dismissed rumors he popped the question over the holidays.

"I'm not engaged," he told People, but added "I'm very happy."

Another source close to Seacrest played coy when asked to confirm or deny the upcoming engagement.

"If Ryan was planning to propose, why would I spoil the whole surprise for him?" the insider said, but gushed about how in love the couple are.

"I don't think I've ever seen him like this over a girl before, ever... they fit together so perfectly.

"All his family adore her too, and I know his mom would be really happy to see him settle down with Julianne and work on giving her some grandchildren!"

Credit: Radar Online

Finished up with a weeklong stay on the east coast, Jessica Simpson was spotted arriving on a flight at LAX Airport in Los Angeles on Saturday night (January 8).

Bundled up after leaving the bitter Big Apple weather behind, the "Do You Know?" darling flashed her glitzy engagement ring while passing through the terminal en route to an awaiting ride.

Credit: Celebrity Gossip

Christina Aguilera's new boyfriend put a ring on it, but don't get the wrong idea.

Matt Rutler "gave [a ring] to her for her birthday," a source tells PEOPLE. "It's not an engagement ring and they're not engaged. It was a surprise gift from him."

Although the lovebirds aren't necessarily saying "I do" anytime soon, they are getting more serious. Rutler's mom has had the honor of meeting Aguilera. And Rutler was by Aguilera's side at her New Year's Eve bash, which was attended by her own mother, brother and sister.

Aguilera recently introduced Rutler to her son Max when she brought him to the Peterson Automotive Museum.

"Christina took Max on the fun outing so he could bond with Matt," a source says. "Max was initially a bit shy, but later warmed up to Matt. It seems very important to Christina that Max got along with Matt."

The source also says Rutler has been spending the majority of his time staying at Aguilera's Beverly Hills home, while the singer's ex, Jordan Bratman, is now living in a rental home nearby.

Credit: People

Hugh Hefner and his fiancée Crystal Harris welcome ET's Kevin Frazier into the Playboy Mansion for the dish on their wedding, their 60-year-age gap, and whether or not they plan on having kids!

Hugh and Crystal tell Kevin they're eyeing a summer wedding at the Mansion, an "intimate" ceremony with close friends and family -- "no big, blow-out affair," Hef says.

"Giving it another chance after a couple of failed marriages is an adventure, but it's something that I'm committed to," the Playboy mogul says.

But what about that big age gap between 84-year-old Hef and 24-year-old Crystal? Is it problematic? "I don't notice the age difference with Hef at all," Crystal says. "If anything I have to keep up with him."

Speaking of keeping up, Kevin's gotta wonder: Is Hugh still sexually active? "I'm doing my best. Dancin' as fast as I can," the energetic 80-something says with a smile.

Which begs the question: Does Hef want more children? "Well, we'll see. That's not part of the big plan," he says.

One thing that's not in question: Hef's love for his Playmate bride-to-be. "She's a beautiful human being inside and out; a woman with real character and humor," he says. "We're really devoted to each other. I think that the relationship is the center of both our lives."

Credit: Entertainment Tonight

It wasn't just that Hugh Hefner presented Crystal Harris with an engagement ring on Christmas Eve – it was how he did it that impressed her.

"We were up in the bedroom," Harris, 24, tells PEOPLE, "and my favorite movie is The Little Mermaid, so he had the ring in a Little Mermaid box, and that was so special. I opened it and the first thing he said to me was, 'I hope it fits!' "

Adds Hefner, 84, "I got her a little music box with the Mermaid theme to it, and it just looked like the perfect size and the perfect place to be the ring box. So when she started unwrapping that gift, I reached over and wound it so it was playing music while she discovered what was inside."

Although she cried with happiness, Harris says, "There wasn't any 'down-on-one-knee' or anything like that, because we are not traditional."

The ring is a circle diamond "a little over three karats," says Harris, "and it's on platinum setting and it has diamonds all around the band as well. It's so pretty."

Credit: People

This bunny's got bling!

When Crystal Harris, 24, accepted an engagement proposal from her love, Hugh Hefner, 84, she got a sizable sparkler, too.

The 2009 Playmate of the Month showed it off on Twitter on Thursday. "For those of you who have been asking to see my ring here it is," she Tweeted. "My engagement ring from my love."

If diamonds are any indication of that love, then it's sizable. Jewelry expert Michael O'Connor tells Us Magazine that the ring appears to have a 3 1/2 carat brilliant-cut diamond set in platinum with micro pave diamonds the band.

"The round center gives the ring a classic style, while micro pave makes it more modern and youthful," he tells Us.

O'Connor's estimated cost of the ring: $90,000.

Harris began dating Hefner in January 2009. Their marriage will be the third for the Playboy founder.

Credit: Us Magazine

In their first interview since becoming engaged, Playboy founder Hugh Hefner and his gorgeous Playmate fiancee Crystal Harris spoke exclusively to Radar Online about the proposal and revealed that the ring didn’t fit!

"It couldn't have happened in a more loving way," Hef, 84, said about the Christmas Eve proposal.

Crystal said she knew she was getting a ring because one of Hef’s staffers helped her figure out what kind of diamond she wanted, but she was still surprised when he finally presented it to her.

"I love the Little Mermaid and Hef gave me a Little Mermaid music box and he wound it up and when I opened it the ring was in a box inside. I cried!"

"There was no down on one knee; we don’t follow traditions like that. When I opened the box Hef said ‘I hope it fits,’ but it was too big! I had to get it re-sized!"

The happy pair hasn’t set a date yet but Hef told Radar Online that the wedding might become a reality show.

"The wedding will definitely be at the Mansion," Crystal revealed. As for her dress? "I would love to design my own dress."

Hefner told Radar Online that he isn't going to go wild before the wedding, but admitted that he has had a charmed life. "I've been having my bachelor party for the last 50 years."

Crystal said that they have the full support of his children. "I love Hef’s sons, they’re great and they’re really happy about the engagement."

According to Crystal, she and Hef aren’t planning to have any children. "I’ve always said I don’t want kids, just animals and there are plenty around here."

Crystal mused on what she loves most about her new fiancé. "He is the nicest person I’ve ever met in my whole life. He is one of the best influences on me and I love him."

Hef spoke fondly about Crystal. "Her personality and her character are what I love. She's very upbeat and a loving person and doesn't tend to have moods. She is always looking on the bright side. She's not petty, she has good character and is down to earth.

"This is the final act for me and the best," Hef said about his engagement and upcoming marriage to Crystal.

Credit: Radar Online

Hugh Hefner's 24-year-old fiancée Crystal Harris flashed the diamond-laden engagement ring she received when the 84-year-old Playboy founder proposed to her on Christmas Eve.

"For those of you who have been asking to see my ring here it is... My engagement ring from my love @hughhefner," she Tweeted, linking to a picture of the ring.

Harris, December 2009's Playboy Playmate, told News Of The World that between she's "not after Hef for his money" as she has her "own career going."

Hefner's past wives include former Playmate Kimberly Conrad and Mildred Williams.

Credit: Radar Online