12 of 17:
Shawn Johnson - this Olympic gold medal-winning gymnast won season 8 in 2009. The 20-year-old athlete was the youngest contestant on 'Dancing With The Stars,' when she was 17. Johnson was training for the 2012 Olympic Team, but withdrew due to an injury and retired from the sport.
She will return for the 15th season of the reality dancing competitions, 'Dancing With The Stars: All-Stars,' which is slated to premiere on Monday, September 24 at 8 p.m. ET/PT on ABC.
(Pictured: Shawn Johnson and Mark Ballas appear in a still from the 2009 season 8 of 'Dancing With The Stars.')
(ABC Photo/ KELSEY MCNEAL)