Washington, Feb 24 : Beyonce Knowles has invited fans to participate in an online dance contest.

The fans will be required to submit videos of themselves dancing to the singer''s Single Ladies (Put A Ring On It) hit, reports Contactmusic.

The winner will receive 250,000 dollars and the video will be shown during Beyonce''s upcoming world tour.

The deadline is 6 March (09).

The R and B superstar was recently named the richest star under 30 years old, and has an estimated 80 million dollars in the bank. (ANI)