Lady Gaga will be performing with up and coming band the Rolling Stones, she's announced on Twitter.
"I am so honored [SHE MEANS 'HONOURED'] and excited to announce I will be performing with @rollingstones on Dec15 for their 50th Anniversary Concert "One More Shot"," she announced, before adding: "He had me at "hello, it's Mick."
The 'gig' will take place at the Prudential Center in Newark, which is in New Jersey.
Apparently you can watch it online and there's more information about all that here.