Ellen Degeneres performed on 'So You Think You Can Dance' last night (12.08.10).

The talk show host - who recently quit her position as a judge on singing talent show 'American Idol' - stepped up to replace injured contestant Alex to partner seasoned performer tWitch in a high-energy routine to 'Outta Your Mind' by Lil' Jon and LMFAO.

She said afterwards: "I have had so much fun and it broke my heart when I saw the injury. As a joke, I said it'd be fun to do and it became a reality."

The contest - which is hosted by British presenter Cat Deeley - was won by 18-year-old Lauren Froderman, beating 18-year-old Kent Boyd and Robert Roldan, 19, into second and third place respectively.

Lauren said: "I have been working my whole life for something like this."

Last night's episode marked the end of the seventh and final season of the show.