Best Celebrity Instagrams Of The Week: Katy Perry and Ellie Goulding Get Silly, Cameron Diaz Posts Makeup-Free Selfie and More!

According to Katy Perry, "THIS IS POP MUSIC." Katy, can you please have girls night out with Ellie Goulding more often so we can get hilarious pics like this?

Oh.my.gosh. We honestly don't know what else to say about Drake's adorable Throwback Thursday snapshot.

Shay Mitchell got très artistique in Paris while exploring the beautiful city!

Cameron Diaz looked stunning with a makeup-free face while receiving the first bound copy of The Body Book. "One of my proudest moments," the blonde beauty exclaimed!

After Gisele Bundchen's controversial breastfeeding photo this week, Emmy Rossum followed in the model's footsteps by posting this mock snapshot that read, "Hey @giseleofficial, I feel ya girl. #kidding #fakebaby #soymilk #shameless."

We're feeling Usher's longer locks. Are you? At the end of the day though, Usher will always be a total heartthrob!

Kim Kardashian pretty much nailed her recreation of Elizabeth Taylor's famous photo. Can we also talk about all the gorgeous bling happening in this shot? Those rocks are insane!

It's hard to believe that Mason Disick is already 4 years old! In honor of his big birthday, Kourtney Kardashian and the gang hit Disneyland for a fun filled day of Mickey and Minnie Mouse.

Snooki and JWoww braved the cold New York City weather while adorned in matching leather jackets!

Derek Blasberg was, "Living a simple life in Miami" alongside Nicole Richie and Paris Hilton who reunited at Art Basel Miami.

"I don't wanna leave my babies :(" Miley Cyrus sweetly noted before heading back to her crazy work schedule.

Yay! Jessie James was all smiles as she revealed to fans a snapshot of her 6 month baby bump!

Melissa Rycroft also showed off her growing belly before heading out to enjoy the chilly winter weather.

It looks like Vanessa Hudgens found two new friends while out exploring. She even joked, "I found my pirate of the Caribbean. Aye matey!"

Gia is looking more like her mom Teresa Giudice every day! Can you believe Gia will be a teenager in January? Where has the time gone?

Kelly Ripa and Michael Strahan couldn't help but get into character with their guest performers, Ylvis. Is "What Does the Fox Say?" stuck in your head now?

Danity Kane's Aubrey O'Day and Dance Moms' Abby Lee Miller snuggled up in front of the Christmas tree while filming a TV segment together. Talk about an unexpected duo!

Kacey Musgraves was over the moon to be hanging out with country favorite, Little Big Town. Is there a possible duet in store?