Nicole Saft (born 19 November 1975), professionally known as Rollergirl, is a German singer with a number of successful tracks such as "Dear Jessie" (a Madonna song) and "Luv U More," the latter being a cover of a song by Sunscreem.

The love for rollerskates developed early when working at a rollerskating rink. Nicole was discovered by German producer Alex Christensen on the Spanish island of Majorca and signed up for auditions. In 1999, Alex produced the song "Dear Jessie" for Rollergirl, which was successful as the opening song at a techno-parade in the United Kingdom, where Nicole continued to work using the stage name "Nicci Juice". The pseudonym "Rollergirl" was taken from Heather Graham's role as as naive young porn starlet in the movie Boogie Nights.

"Geisha Dreams" (2002) was Rollergirl's last release before Nicole focussed on her private life around Alex Christensen and their son, born in 2003. Nicole Saft has also appeared with Daniel Hartwig as co-presenter