Tammy may refer to:

Willow Camille Reign Smith (born October 31, 2000), often known simply as Willow, is an American actress and singer. She is the daughter of Will Smith and Jada Pinkett Smith, and the younger sister of Jaden Smith. Smith made her acting debut in 2007 in the film I Am Legend and later appeared in Kit Kittredge: An American Girl alongside Abigail Breslin. She received a Young Artist Award for her performance.

Apart from her acting she launched a music career in the fall of 2010 with the release of her singles "Whip My Hair", "21st Century Girl", and signing to her current mentor Jay-Z's record label Roc Nation. "Whip My Hair" peaked at #11 on the Billboard Hot 100. The video was nominated for Video of the Year at the BET Awards of 2011.

Smith is the daughter of musician-actor Will Smith and actress Jada Pinkett Smith. She has an older half-brother, Trey Smith, and an older brother, Jaden Smith; both are also child actors. Smith is African-American, and also has West Indian, Creole, and Portuguese-Jewish ancestry on her mother's side. Smith and her brothers are youth ambassadors for Project Zambia, which provides assistance for Zambian children orphaned by AIDS in conjunction with Hasbro.

Peter Gene Hernandez (born October 8, 1985), better known by his stage name Bruno Mars, is an American singer-songwriter and record producer. Raised in Honolulu, Hawaii by a family of musicians, Mars began making music at a young age. He performed in various musical venues in his hometown throughout his childhood. He graduated from high school and then moved to Los Angeles, California to pursue a musical career. Mars produced songs for other artists, joining production team The Smeezingtons.

Mars had an unsuccessful stint with Motown Records, but then signed with Atlantic Records in 2009. He became recognized as a solo artist after lending his vocals and co-writing the hooks for the songs "Nothin' on You" by B.o.B, and "Billionaire" by Travie McCoy. He also co-wrote the hits "Right Round" by Flo Rida featuring Ke$ha, and "Wavin' Flag" by K'naan. In October 2010, he released his debut album, Doo-Wops & Hooligans. Anchored by the worldwide number-one singles "Just the Way You Are" and "Grenade", the album peaked at number three on the Billboard 200. Mars was nominated for seven Grammys at the 53rd Grammy Awards, winning Best Male Pop Vocal Performance for "Just the Way You Are".