Best Celebrity Instagrams Of The Week: Khloe Kardashian Hangs With P. Diddy, That '70s Show Stars Reunite and More!

Amidst all the media buzz, Khloe Kardashian caught up with her pal P. Diddy.

Hello Justin Bieber! The singer showed off his chiseled abs after a workout with his trainer.

Jacob Artist, Becca Tobin, Jenna Ushkowitz, Chord Overstreet and Kevin McHale got silly on the set of Glee.

Questlove shared this gem with followers and said, "This might be @latenightjimmy's best week for music highlights ever." Did you catch Ylvis' performance of "What Does the Fox Say?"

Ludacris reminisced on the past with this sweet pic featuring his daughter Karma.

Ali Fedotowsky is officially a mom...to a new rescue puppy Owen!

Ahh it's a That '70s Show reunion! Check out Topher Grace, Laura Prepon, Ashton Kutcher, Mila Kunis, Wilmer Valderrama and Danny Masterson jamming out together.

John Legend posted this cool behind-the-scenes shot form his latest shoot for Definitive Technology.

How cute is 2 Broke Girls' Beth Behrs with her dad in this old school photo?

Rita Ora always knows how to bring it. From the Moschino printed suit to the bold red lip, we're obsessing over this look!

What a sweet shot of Victoria's Secret model Marisa Miller and her precious son Gavin!

Can you guess which celeb sisters are in this adorable Throwback Thursday? Kyle and Kim Richards from Real Housewives of Beverly Hills!

Bella Thorne celebrated her 16th birthday this week and started out the day with a yummy family breakfast!

The hilarious Robin Williams took a break on set for a quick pic with his The Crazy Ones co-star, James Wolk.

Muah! Kristin Cavallari teamed up with Ulta to raise money for the Breast Cancer Research Foundation.

Kandi Burruss was all smiles as she showed off her new fiery red 'do!