When fashion choices meet high school problems!

Lady Gaga left her NYC apartment to rehearse some tunes with collaborator Tony Bennett for an on-air appearance yesterday, and the singer looked like her typical stylish self, but apparently there was a reason for her bulky coat selections. "Back in the New York Groove, getting ready to see Tony [Bennett] and trying to figure out how I’m gonna cover this hickey up for holiday TV! Oh Taylor," she tweeted earlier in the day. Gagaloo and her TV actor beau Taylor Kinney must be pretty frisky!

Mother Monster and the legendary jazz singer teamed up for a joint album "Cheek to Cheek", which was released in September and went straight to the top of Billboard charts, and now it has been announced that the duo will perform at the Cosmopolitan Las Vegas on December 30. Tickets for that show are bound to sell like hot cakes!