Best Celebrity Instagrams Of The Week: Nicole Richie Parties With Famous Pals, Twilight Cast Have Mini Reunion and More!

Derek Blasberg is one lucky guy! While attending a benefit at the Los Angeles County Museum of Art, the author got silly with his celeb pals including Nicole Richie and Rosie Huntington-Whitely.

Selena Gomez couldn't help but cuddle up to her best friend Demi Lovato backstage at The X-Factor. "It's just the evidence of forever. No matter what @ddlovato," the singer sweetly wrote.

While Hilary Duff claims "there are so many things wrong with this," we have to disagree because in our eyes her old school glamour shot is pure perfection!

Nikki Reed, Peter Facinelli and Jackson Rathbone enjoyed a mini Cullen family reunion this week. We're squealing with excitement over the impromptu Twilight gathering!

Reason #3673 why we love Katy Perry: She makes witty jokes on Instagram, "Sometimes I can get a little crabby."

Happy Endings' Adam Pally has been killing it on The Mindy Project. Can we also mention that we're loving all the patterns happening in this photo?

Talk about Transformation Tuesday! It only took Vinny Guadagnino three weeks to revamp his now chiseled physique. But how did he do it? By working out and a cleanse.

"Trying to convince @blakeshelton to go #NoShaveToday with me. He's 1 adult drink away from saying YES," Carson Daly revealed on the set of The Voice. What do you think? Should Blake join in on the no shave November fun?

Three of our favorite Hollywood starlets finally met Wednesday at the 2013 CMAs. Lucy Hale even called Lennon and Maisy "angels"—aww!

Jamie Lynn Spears spent some mommy-and-me time with her precious daughter Maddie with a fun lunchtime surprise at school.

Life is good when you have a pup by your side and John Legend could not agree more, "Pippa has officially joined the #madetolovetour!"

Thanks to Zooey Deschanel, fans got an inside look at Max Greenfield, Jake Johnson, Lamorne Morris and Damon Wayans Jr. behind-the-scenes of New Girl.

In honor of Kevin Jonas' birthday, Nick Jonas brought fans down memory lane with a vintage photo of the JoBros with Sir Paul McCartney. This snapshot also makes us miss Nick's curly locks!

Kathy Griffin's ban from The View has finally been lifted so the comedian took a celebration photo with the one and only Barbara Walters!

After seeing Kevin McHale, Chord Overstreet, Alex Newell, Blake Jenner, Jacob Artist and Becca Tobin goofing around backstage, we now more than ever want to be part of the Glee family!

Our immediate thoughts on this large, fluffy pooch are identical to Victoria Justice's, "I'm in love." Seriously, where can we find this adorable pup?

Emma Roberts stopped for a break at the Voodoo Fest for a few funny faces with her bestie!

Are you as obsessed with 2 Broke Girls as we are this season? If so, you'll love this pic of Kat Dennings and Matthew Moy!

James Van Der Beek cheered on Los Angeles Kings with his celeb buddies Kevin Connolly and Rick Donald. Go team!

"I just got Beth drunk and made her join Instagram. Follow her @BethOStern," Whitney Cummings wrote. Beth Stern then followed up with, "Finally on Instagram. Thanks, Whitney... I knew something great was going to come out of our relationship."