It's man vs. boy!

David Arquette, 40, and Rob Kardashian, 24, and the rest of Season 13's Dancing With The Stars cast celebrated the season's halfway point at STK Lounge in Beverly Hills Tuesday night.

But at the soiree, while David looks dapper in a suit, Rob dressed down in a sweater and baseball cap. Rob has some growing up to do!

Of course, even a celebration can be a little nerve-racking. Arquette Tweeted, "#DWTS being at a Dance Party with professional dancers is an intimidating prospect". Give yourself some credit, David! You've made it this far!

Also at the party were Derek Hough and Mark Ballas. While Hough looked handsome and playful, Ballas seemed angry (he and partner Kristin Cavallari were eliminated early on.) See the photos after the jump!

That 70s Show star Danny Masterson and longtime girlfriend (eight years!) Bijou Phillips have finally married, People reports.

The couple had been engaged since 2009.

The two wed in Ireland on Tuesday in front of a small group of family and friends. The wedding, though intimate, was a formal affair at an Irish castle.

The bride, 31, wore a Zac Posen gown. Masterson, 35, had brother Chris Masterson by his side as his best man.

Justin Bieber has finally premiered the video for his new single, "Mistletoe", and we can't stop playing the catchy holiday-themed song!

The Biebs recently told Ryan Seacrest he wanted to do "something that people haven't heard before," and he also revealed new deets on his upcoming Christmas album, Under The Mistletoe, telling MTV that the LP was inspired by ... cookies?!

Justin said, "I was going to put out my album soon anyways, and I was thinking, 'It's near Christmas time. If I'm going to release an album near Christmas, I figure maybe I'd just do a Christmas album'. The fans get more music, and everyone's happy ... I just picked my favourite Christmas songs. I picked 'Silent Night,' I picked 'Santa [Claus Is] Coming to Town,' because everyone loves those songs. Those are classics. They get people excited for Christmas."

The 17-year-old pop phenom continued, "It's different, because you've gotta think Christmas time. You've gotta think, 'What's at Christmas? Mistletoe, reindeer, Santa, all these things.' And especially when it's not Christmas time, it's hard to really get your mind around it. But once you get into it, like, I was really thinking it was Christmas time when I was writing this album. ... We had Christmas cookies [in the studio]."

Mariska Hargitay is now a mother once again!

The Law and Order actress, married to Peter Hermann, adopted baby boy Andrew Nicolas Hargitay Hermann ... just six months after adopting daughter Amaya Josephine, according to People.

Hargitay, 47, tells the mag:

“We never in a million years thought it would happen this quickly, but something inside of us knew that this was right, and we said, ‘Yes, yes, yes!’ We knew this was our guy. Everything about it felt right. It felt divinely right.”

The actress is also mom to 5-year-old son, August.

LeAnn Rimes is back home from Chicago for good, and she wasted no time in making her family a priority.

The 29-year-old country songstress, hubby Eddie Cibrian and sons Jake and Mason, hit up the Wood Ranch Restaurant in Agoura Hills ... along with LeAnn's mom, Belinda Rimes accompanied by "bonus dad" Ted.

Ms. Rimes, wearing cowboy boots and a sexy cream dress, told us earlier this week, that she's thrilled to be living full-time in Los Angeles to spend more time with family. Mission accomplished!

Miranda Kerr and her already-million dollar body just got even pricier with the help of Victoria's Secret's $2.5 million diamond encrusted bra.

No doubt, Orlando Bloom is lovin' that his gorgeous wife's chest is the envy of women around the world.

The mega-expensive lingerie, with 142 carats of white and yellow diamonds, is part of VS's Christmas Dreams & Fantasies catalogue.

Other models who have previously worn the pricey fantasy bras include Heidi Klum, Tyra Banks, Selita Ebanks and Adriana Lima.

Looking at this picture of Miranda ... we think this kind of support is worth every penny!

Lindsay Lohan will be at the Airport Courthouse in LA Wednesday to appear before Judge Stephanie Sautner for a progress hearing.

The hearing, which has been scheduled since the summer, pertains to Lohan's court-mandated community service and counseling.

Both sentences were given to her instead of jail time for her drunk driving probation and misdemeanor theft charges.

But rumors of Lohan's poor showing at community service might mean a rough appearance today.

Sautner told Lohan in July that she would not get "an extra five minutes" to complete her service; she has until April to complete 480 hours.

Reportedly, Lohan has finished only about 20 hours (she was assigned to work at the LA Downtown Women's Center and the City Coroner's office.)

If Lohan does not complete her community service on time, she faces a year-and-a-half behind bars.

Her bump may be growing, but Hilary Duff is still determined to keep the baby weight down with consistent trips to her favorite pilates studio in LA.

The Beauty and the Briefcase star recently told Chelsea Handler on her late night show that everything about her pregnancy has been pretty normal -- with the exception of two big things.

Duff told Handler of her growing chest: "These are new. These are, like, new and different, so that can be a good and bad thing, but other than that, seriously, it's pretty easy!"