The 'Poker Face' singer, 28, and her model/actor beau, 33, attended a Harper's Bazaar party to celebrate New York Fashion Week and made a stunning pair.
Lady Gaga stole the limelight (naturally!) in an unusual monochrome dress which flashed plenty of cleavage and legs, while Taylor kept it simple but sexy in a dark suit.
And it's clear to see that the duo, who have been dating for three years and describe themselves as 'kindred spirits', are totally smitten with each other.
The star-studded affair, Harper's Bazaar Celebrate Icons by Carine Outfield, took place in New York (5 September) and attracted fashion's finest, including Donatella Versace, Alexa Chung, Kendall Jenner and Candice Swanepoel.
While Lady Gaga was there to mingle, she also performed at the glitzy event.
Rocking her latest short blonde bob - we love! - she sang jazz for the enthralled crowd, backed by a swing band.
After the event, which looked like SO much fun, Lady Gaga took to Twitter to share some pictures and her emotions with her fans.
She said: "Here's a photo of me during the performance, in my own little world singing songs that have reverberated off the wall of the Plaza for decades.
"We didn't have a lot of time to take pictures I was very busy, but we had a marvelous time tonight at the Harper's party and I immensely enjoyed singing jazz for the crowd. Night night Monsters."
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