Christina Aguilera trips again (but this time not over her lines) as she takes a tumble during opening Grammy performance

By DAILY MAIL REPORTER Tribute: Yolanda Adams, Martina McBride, Christina Aguilera, Jennifer Hudson and Florence Welch perform a medley of Aretha Franklin's hit songs to open the 53rd annual Grammy Awards in Los Angeles - Lady Antebellum wins Record and Song of the Year- Shock win for Arcade Fire as they scoop Album of the Year- Lady Gaga wins three awards- Eminem won only two awards despite t...