Katy Perry Wishes Lady Gaga Happy Birthday On Twitter

The 'Part Of Me' singer tells the 'Born This Way' star to have a drink on her to celebrate turning 26.

Katy Perry sent Lady Gaga a personal message yesterday to celebrate the singer's birthday.

The 'Marry The Night' singer turned 26 yesterday (28th March) and 'Part Of Me' star Katy posted a message on Gaga's Twitter account with birthday wishes.

"Happy birthday lovely, have a whiskey for me :) @ladygaga," Katy tweeted yesterday.

The 'Teenage Dream' singer also responded to a Twitter interview Madonna conducted with her fans this week, where the 'Give Me All Your Lovin' star revealed he thoughts on Katy.

"She's hot. If she was my girl I'd never cheat on her," Madonna said of Katy Perry, in response to a fan question.

Katy later replied: "Well played my Queen. My move..."

Katy Perry released her album repackage 'Teenage Dream: The Complete Confection' this week, and says the album is a present to her hardcore fans and those who are just starting to get into her music.