Katy Perry was one of Coachella’s biggest stars this past weekend, and by the looks of this new video, the singer was having a very good time!

Debuting her new dark purple hair, and wearing a dress she described as “sponsored by courtney love, virgin suicides & fern gully” the singer lip-synched Carly Rae Jepsen’s hit “Call Me Maybe”.

The 27-year-old singer partied poolside with her friends and videotaped themselves goofing around to the teeny-bopper tune, then uploaded it on YouTube. Jepsen was so excited Perry enjoying her song. “Well… @KatyPerry I have to say that you made my night!” she tweeted on Tuesday.

Katy isn’t the only celebrity lip-synching “Call Me Maybe”. Justin Bieber, Selena Gomez and Ashley Tisdale made their own video last month. (CUTE!) Watch that video below!

Jepsen’s song is currently sitting at No. 10 on the Billboard Hot 100 chart, just below Katy Perry’s “Part Of Me.”

Zac Efron stopped by the Jimmy Kimmel show last night to promote his new movie, ‘The Lucky One’, which must have taken place after the premiere in Hollywood.

Jimmy talked with Zac about the movie (zzzzz) and ended up challenging him to a bra-unhooking competition! Watch the video below to see who wins (is there any doubt?)!

PS: Here are the pictures from the premiere in Hollywood. Why does Zac’s suit look wet – and better yet – what in the world is Audrina Patridge doing there?

Also pictured: Taylor Schilling (Zac’s love-interest) and Ashley Tisdale. Love Taylor’s dress!

Photos: Fame/Flynet

‘The Bling Ring’ is based on the real-life group of teenagers based around Calabasas, California, who burglarized the homes of several celebrities including Paris Hilton, Megan Fox, Rachel Bilson, Lindsay Lohan, Orlando Bloom and Ashley Tisdale.

Emma plays Nicki, a girl whose ex-Playboy model mother (played by Leslie Mann) schools her two daughters on the importance of being famous.

Sofia Coppola is directing the project, which began filming in March.

Emma Tweeted from the set of the movie: “Filming Bling Ring is going great. As Israel would say ‘we are slaying this!’. Thanks for the good luck messages.”

Photos: Fame/Flynet

Katy Perry was one of the many celebrities that attended the Kids Choice Awards over the weekend. She wore this strange green getup, which in my opinion is quite hideous. Maybe she was trying to look like she was wearing slime?

Below are some more great pictures from the event.

Photos: Jennie Garth and daughter Luca Bella Facinelli, Sarah Hyland, Jada Pinkett Smith (what the HECK is she wearing!) with kids Willow and Jaden Smith, Selena Gomez, Ashley Tisdale and the beautiful Emma Stone!

Photos: Fame/Flynet

Vanessa Hudgens’ everyday style may be hit or miss, but she always brings her ‘A game’ to the red carpet! Here she is in a stunning strapless yellow gown last night at the premiere of ‘Journey 2: the Mysterious Island’ – with her current beau Austin Butler.  It’s a little ‘Beauty and the Beast’-ish, isn’t it? (Belle’s yellow ball gown)

On hand to show her best friend support was Ashley Tisdale.  Ashley was workin’ it in this pink lace mini dress.  She works out hard and it shows.  She looks fabulous!

Photos FameFlynet

Singer and actress Ashley Tisdale goes shopping with her mom Lisa Tisdale at the Madison Shoe Store in Beverly Hills.

She doesn’t looked to pleased to have her picture taken.

Photos: Fame

Is there anything going on between Zac Efron and Ashley Tisdale? The ‘High School Musical’ stars spent their fourth of July holiday together!

Zac Efron gives Ashley Tisdale a ride on his shoulders at a 4th of July party in Malibu!

UPDATE: No such luck…. the two are just buds! Too Fab has the scoop:

After some curious photos surfaced this weekend of the two looking very cozy during Ash’s birthday party, the rumors started — suggesting Efron had moved on from his ex-girlfriend Vanessa Hudgens with another “High School Musical” star, one who also happened to be one Hudgens’ best friends.

Moments ago, Tisdale responded to the Disney dating controversy, tweeting “Don’t believe all pictures. People r gonna come up with stuff to say bc it sells! I had such a great birthday party with my friends, Family, and BOYFRIEND Scott. I will not let stupid rumors ruin all the fun we had! Xoxo”

Anyone looking for more proof that the two are just friends need look no further than the photo below — showing Ashley getting a kiss on the cheek from boyfriend Scott Speer the night of the party.

Photos: Fame