Though not known for doing many guest vocal appearances, Lady Gaga provided the chorus for a single from which rapper in 2009?

Explanation

"The Fame Monster" is the third EP by Lady Gaga. It was released on November 18, 2009 and won The "Grammy Award for Best Pop Vocal Album" in 2011. Its lead single, "Bad Romance" reached number two on the Billboard Hot 100. This album also includes the songs "Alejandro", "Monster", "Speechless", "Dance in the Dark", "So Happy I Could Die", "Teeth" and "Telephone" which features American R&B singer Beyoncé.