Hilary Duff was snapped leaving her doctor's office yesterday after a pre-natal check up, and it seems like she might be a bit too pregnant for Pilates now! We haven't seen Hil at the gym for about two weeks, and she's definitely been laying low.

Over the weekend Hil and hubby Mike Comrie were spotted at the movies, and the former Lizzie McGuire starlet is catching up on her fav TV shows as well. The other day she tweeted, "So obsessed with @thevoice best part is watching cee-lo stroke his fluffy white cat! Sooo legit!" We'd have to agree!

Paris Hilton is in Shanghai to promote her new sunglasses line, and the heiress posted this hot pic on Twitter from her press conference yesterday. "Just finished a very long day of interviews, photoshoots, press conference & my new sunglasses line runway show," she wrote. "What a successful launch!"

After winning $30,000 playing blackjack at Wynn Las Vegas over the weekend, it looks like Miss P is on quite a roll! While we're happy she's having such a blast jet-setting around the world, we wish she'd get her sexy butt back to California...

Michael Rozman/Warner Bros.

Taylor Swift and Zac Efron appear on The Ellen DeGeneres Show today, and the two chat about everything from their upcoming animated flick, Dr. Seuss' The Lorax, to how they spent Valentine's Day.

When asked whether they were an item, Taylor laughed off the report and told Ellen, "We are not a couple. He’s awesome, we are not a couple though. You hear people get together when they’re shooting movies, co-stars. But not like animated co-stars. You know what I’m saying."

Too bad! Taylor also reveals that she spent Valentine's Day with several gal pals, and while it wasn't all that romantic, it sounds like she had a good time! "I’m not saying that being single is pathetic," she told Ellen. "We’ve talked about this. I think it’s awesome. I had all my single girlfriends over and we ate junk food and just ate what ever we wanted and danced. We made these little profile cards about why we’re single."

Zac quipped, "That’s so different [from] what single guys do," adding that he went to a movie screening and cooked dinner for "a friend", whose name he didn't share. Hmm, could it be Lily Collins? After spotting the duo out together twice this month, it seems like things are really heating up between them! But she can't be happy that he's referring to her as a "friend!"

Mariah Carey is still emotional over the loss of her friend Whitney Houston.

The 42-year-old songstress stopped by Good Morning America to discuss her memories of Houston. The mama of twins said:

"I'm almost incapable of talking about this still. It's very heavy emotionally. I loved her. We all loved her. May she rest in peace... her legend's gonna go on forever."

Carey and Houston teamed up for the 2007 song "When You Believe." When asked about the collaboration, Nick Cannon's wifey added:

"It was great and I don't think people could ever understand our relationship. There was always this supposed rivalry in the beginning and then we did the duet and we became friends."

Click thru to see one of Whitney and Mariah's most memorable performances together.

Nick Jonas and Delta Goodrem have called it quits after 10 months together.

Goodrem's rep released the following statement, "Nick and Delta have decided mutually to end their relationship."

The couple were very hush-hush about their relationship at the beginning ... claiming to be collaborating musically. However, last year, they finally stepped out as a couple.

The 27-year-old Aussie's rep added:

“At this point in time, they are both focused on their careers as they go on different paths. They remain friends and wish each other the best for the future.”

Jonas is currently performing on Broadway in the play How to Succeed in Business.

Where has Hayden Panettiere been hiding her hotness?! The actress has been keeping a low profile for the past few months, but last night she stepped out at the 20th Anniversary party for Vanity Fair's “Vanities” and she looked absolutely amazing! The former Heroes honey was joined by new beau Scotty McKnight, who plays for the New York Jets, so it looks like she's definitely moved on from former flame Wladimir Klitschko!

Other starlets including Malin Akerman, Paula Patton, Rashida Jones, Kate Mara, Anna Kendrick and Stacy Keibler attended the pre-Oscar bash ... check out the gallery below for more photos!

Lindsay Lohan is gearing up for a big comeback!

The 25-year-old actress has officially landed the role of Elizabeth Taylor in Lifetime's upcoming film Liz and Dick, according to Access Hollywood.

The Mean Girls starlet, who will be allowed to take on the role if she continues to follow the rules of her probation, will play the lead of the Larry Thompson-produced flick.

Lilo is also going to be hosting Saturday Night Live on March 3.

Go Linds!

The New York Knicks lost to the New Jersey Nets Monday night, but it didn't stop new parents Jay-Z and Beyonce from a romantic night out.

Blue Ivy's parents, who are no doubt Knicks fans, were all smiles after leaving dinner in the Big Apple.

We're lovin' Beyonce's bright yellow jacket and sparkly Louboutins. Parenthood sure looks good on them!