Much like the pair of exclamation marks inexplicably attached to its title, Lady Gaga will pull double duty on Wednesday night's (November 30) [article id="1675114"]Grammy Nominations Live!![/article] telecast, serving as both the opening and closing act.

That's according to the Mother Monster herself, who took to her Twitter account to break the news following rehearsals, and, in the process, also revealed that one of her two performances was going to be a collaborative effort.

"I am so excited to open and close the Grammy Nomination concert tomorrow night!" Gaga wrote. "What a blast rehearsing with Jennifer [Nettles] and Kristian [Bush]. Sugarland!"

Gaga and Sugarland will share the stage with a host of other big-name acts, including [article id="1674539"]Rihanna, Usher[/article], [article id="1673691"]Lupe Fiasco, Ludacris[/article] and country crooner Jason Aldean. The event will once again be hosted by LL Cool J, who this year will also take part in a [article id="1674954"]special tribute to the classic hip-hop track "The Message,"[/article] joining Common and members of the Furious Five.

Of course, aside from all of the performances, the telecast also serves as the official kickoff to Grammy season, with nominees in several categories to be announced on air Wednesday night at 10 p.m. ET on CBS. [article id="1675089"]Gaga is expected[/article] to be in contention for a slew of awards, including Album of the Year for Born This Way, and Record and Song of the Year for "Yoü and I." She'll face stiff competition from this year's Grammy fave, Adele, not to mention fellow females Katy Perry, Taylor Swift, Beyoncé and Nicki Minaj.

Catch the special performance -- along with Lady Gaga, Rihanna, Usher, Ludacris, Sugarland and more -- at 10 p.m. ET/PT tonight on CBS.