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28 March 2014, 11:06 | Updated: 28 March 2014, 12:34
The 'G.U.Y.' singer tweeted fans with a link to the birthday message to mark her big day.
Lady Gaga has declared today her "best birthday ever" after fans serenaded her outside her New York City show yesterday (27th March).
The 'Applause' star turns 28 today (28th March) and shared a link to a fan video of some of her Little Monsters singing 'Happy Birthday' to her outside the Roseland Ballroom on Thursday for her residency at the venue.
"I love my fans best birthday ever," Gaga simply posted alongside the clip.
I love my fans best birthday ever http://t.co/QjlYLlu2v7— Lady Gaga (@ladygaga) March 28, 2014
Earlier in the day Lady Gaga was spotted out and about in the Big Apple in an eighties inspired look of high-waisted acid-wash jeans an a rock 'n' roll t-shirt.