So much for the protective older brother …

Kylie, left, and Kendall, right, model. (Twitter)

Rob Kardashian hired his little sisters, aspiring models Kendall Jenner, 17, and Kylie Jenner, 15, to pose sans pants in a photo shoot for his Arthur George sock line.

Kendall and Kylie donned button-down shirts and colorful knee-high socks alongside three other models in the shoot, which Kendall documented in video clips on Keek. (Mom Kris Jenner posted pics on Instagram, like any proud mom would when her daughters go pantless in public.)

Who needs an official press tour when you can do your own? At least that seemed to be Hollywood superstar Brad Pitt’s philosophy regarding his “World War Z” media blitz. The actor was in four cities in one day on Thursday, hitting Atlanta, Philadelphia, Chicago, and Austin, Texas, to introduce the movie at screenings all across the country! "We got something that you've never seen before. It's the most intense thing that you're going to see all summer,” Pitt told the audience in Atlanta. “It's so fun, I'm really happy for you guys to see it."

Fans were clearly shocked and excited to see the 49-year-old take the stage before the movie (who wouldn't be?!). In the new film, out June 21, Pitt plays an ex-U.N. worker who globe-trots around the world looking for a cure for a spreading zombie epidemic in order to save his family and, ultimately, humanity. Judging by his personal press tour, he seems to have learned a thing or two from his character about taking things into his own hands -- and we couldn't be more excited!

Which city do you think Brad will make his next screening cameo? Check out the video for more from his media mania, and be sure to tune in to omg! Insider on TV tonight to see a sneak peek at this Sunday's Tony Awards from the host of the show, Neil Patrick Harris.

Kristoffer Winters and Jeremy Renner (WireImage) We can't imagine Jeremy Renner has much free time these days, between his duties as superhero and new dad -- still the "Avengers" actor showed off an impressive hobby on Thursday in Los Angeles.

Renner hosted an event with luxury mag Robb Report to unveil his latest project: a dramatic home renovation in the swanky Los Angeles enclave of Holmby Hills.

Built with business partner and fellow actor Kristoffer Winters, photos of the project surfaced a few months ago and Renner finally opened its doors to celeb pals and tastemakers with cocktails and live music.

Acquired for $7 million, Renner and Winters gave the property – which sits a stone's throw from Sunset Boulevard – a dramatic makeover. The updated asking price is $25 million.

The joint features a tiled fountain in the foyer, an Old Hollywood-style screening room, an art deco-inspired swimming pool, a master suite with his-and-her walk-in closets and spas, several fireplaces, and a grand kitchen with two marble islands. No big deal.

WireImage"Hollywood Heights" star Cody Longo has hit a new low. The 26-year-old heartthrob was arrested for drunk driving at 2:50 a.m. Thursday morning, the Beverly Hills Police Department has confirmed to omg!.

Cops spotted Longo driving aggressively through Hollywood, following another car way too closely and flashing it with his high beams. Probably not the best idea.

After members of the LAPD West Traffic Division pulled him over, however, things went from bad to worse for the "Days of Our Lives" and "Piranha 3D" alum. He reportedly reeked of liquor, and then proceeded to fail a series of standard field sobriety tests.

Nick Kroll and Amy Poehler at AFI event (Getty Images)It’s a comedy match made in heaven!

Actors Amy Poehler and Nick Kroll stepped out together Thursday night in Hollywood, making it their first official appearance together since they started dating a few months ago.

Avril Lavigne (WENN)(Splash News)

Is Avril Lavigne trying to send the world a message?

The wispy "Here's to Never Growing Up" singer was definitely rocking a fuller midsection Wednesday in London. Wearing a curve-hugging snakeskin print minidress, the 28-year-old had what appeared to be a bump on display and even rested her hand on her stomach in that typical mom-to-be pose … but was it?

Tamar Braxton and husband Vincent Herbert. (Getty Images)Tamar Braxton had better be ready to start singing lullabies!

The "Love and War" songbird and her husband, music producer Vincent Herbert, welcomed a baby boy on June 6.

This is the first child for the proud parents, who married in 2008. The duo have yet to release the name of their new bundle of joy, but the 36-year-old star couldn't wait to share the happy news with her 700,000 Twitter followers. She posted a Twitpic filled with "It's a boy" teddy bears, sunflowers, and the caption: "He's finally here."

It's safe to say Cindy Crawford never had those awkward teenage years! The 47-year-old tweeted a pic of her very first modeling gig as a fresh-faced 16-year-old beauty in DeKalb, Illinois, on Thursday, writing "My very first 'cover' during high school in DeKalb, shot in my high school boyfriend's backyard..."

The snapshot was taken for the cover of the DeKalb Nite Weekly Communiversity Issue on November 3, 1982. Little did young Cindy in a teeny bikini know that it was the start to something really amazing. Even at that age, she knew exactly how to pose!

Somehow we're not surprised that Crawford became a world-famous supermodel ... even though it seems like she is shocked about her fame following this photo. In a follow-up tweet, she said, "Believe me when I say I had absolutely no idea where that photo would lead to!"

While the picture is stunning, the newspaper really wasn't joking when they wrote the caption, "Save this Article" at the top of the issue -- who knew that would become such a good idea so many years later?

Check out this video to see where Cindy's modeling roots all began, and be sure to tune in to "omg! Insider" on TV tonight for all the latest in entertainment.