Jonah Hill and his main squeeze were spotted out and about in Los Angeles over the weekend, and we almost didn't even recognize the Superbad star!

The once portly actor has shed an impressive 30 lbs to prepare for his new role in the 21 Jump Street remake, and when MSNBC asked Hill's publicist for comment on his recent weight loss, the rep replied, "Comment on being healthy?"

Last night Paris, Nicky, Conrad and Barron Hilton dined with parents Rick and Kathy at Madeo, and we can't imagine a better way to celebrate your birthday! Mom Kathy was the one blowing out the candles on the cake, and Nicky and Paris brought their boyfriends Cy Waits and David Katzenberg along, so it sounds like everyone had an amazing time.

Paris tweeted, "Happy Birthday Mom! I love you! You are the best mom in the world! Love Paris xoxo"

When we posted this shot of Amber Rose jogging in Beverly Hills over the weekend, we figured she'd get some comments on the wild leggings, but not her weight! Though it seems like the model has gained a few pounds in her thighs, she's clearly staying healthy by working out, so what's the problem?

The curvaceous model responded to haters on Twitter, writing, "I'm 5'9 148. How am I fat? Man, what have I done so wrong? Be to nice? I just don't get it." The tweet has since been removed, and Kanye West's ex-girlfriend isn't really one to dwell on negativity, so hopefully that means she's moved on! But maybe stick to solid colors for her workout wear next time?

khloekardashian.celebuzz.com

Khloe Kardashian and her basketball hubby are all smiles in a promo pic for their upcoming E! reality show.

Kim's younger sis posted the above photo on her website ... and the following:

“I’m so excited to finally be able to post the first Khloe and Lamar promo image. I’m thrilled with how it came out. Too cute. I love my hubby!”

Khloe added, “sooooo excited and sooooo nervous."

Find out when the show premieres ... after the jump.

20th Century Fox

Robert Pattinson and Reese Witherspoon nearly lock lips in these new stills from Water for Elephants, and we're not sure if we can wait another month for this movie to come out!

So what was smooching the 24-year-old Twilight star like? Reese, who is ten years his senior, recently praised Rob for being “so amazing and wonderful and sweet and just the nicest guy.” So how will their chemistry be on screen? We'll find out on April 22...

Click the gallery below for more pictures, and check out the trailer ... after the jump!

Last night we spotted Gerard Butler jetting out of LAX, and even though we were able to get a glimpse at his gorgeous and scruffy face, we're bummed he's leaving us behind!

Next up for Gerard is Playing The Field, and the Scottish hunk will star opposite Jessica Biel and Uma Thurman in the romantic comedy. Now that Jessica is a single lady, think she'll strike up a romance with Gerry? Butica, anyone?

Ryan Phillippe may be changing diapers again very soon!

The sexy father of two is expecting a baby with gorgeous model Alexis Knapp, according to Us. The couple briefly dated last summer, and just recently, Knapp revealed she's pregnant.

A source tells the mag:

"Ryan doesn't know if he is the dad. If he is, he will take full responsibility for the child."

Phillippe is currently dating Red Riding Hood actress Amanda Seyfried. The 36-year-old actor has two children with Reese Witherspoon ... Ava, 11, and Deacon, 7.

Reps for Phillippe and Knapp have not returned our request for comment.

Find out which pop star will be working with Alexis in her next film ... after the jump.

petewentz.com

Pete Wentz had been rocking his natural curls for quite a while, but yesterday the rocker decided to chop off his fro!

Wentz posted the pix of his new cut on his web site after spending the weekend enjoying fast food with soon-to-be-ex-wife Ashlee Simpson (where he hid his new 'do.)

This morning, Wentz called into Ryan Seacrest's show to proclaim his affection for Ash.

"Ashlee's been my best friend for five years. She's the mother of my child," Pete said, adding, "I have nothing but love and respect for her."

Wentz, who's currently working out a custody agreement with Simpson, went on to say "Going through something like this isn't easy, but we're friends and the most important thing is to put our son first."