Rapper T.I. joined Taylor Swift onstage in Atlanta Sunday night during a surprise appearance at the country star's concert.
Swift introduced T.I. at the end of her set by singing the opening chorus of the rapper's hit, "Live Your Life," according to the Associated Press.
T.I. was released from a halfway house in September after spending 10 months in federal prison on a probation violation.
Swift has featured several guests, including Justin Bieber, onstage during her tour.
The 21-year-old Grammy-winning country and pop singer recently released the single, "Sparks Fly," which is the fifth single from "Speak Now," her third studio album. The record has sold more than 3 million copies in the United States since its October 2010 release.
The singer recently added 10 Australia and New Zealand shows to her "Speak Now" world tour. Swift's U.S. tour dates are largely sold-out through late November. Check out Swift's tour dates on her official website.