Children's TV star Dani Harmer, Westlife's Nicky Byrne, Girls Aloud star Kimberley Walsh and Daybreak's Richard Arnold are the four celebrities officially confirmed for the series so far.
The BBC Strictly site has released clues about other contestants, which hint heavily at Riley and Owen's involvement.
One clue reads "This guy is onto a good thing going", referencing EastEnders actor Owen's reggae pop hit 'Good Thing Going', which reached No.14 in 2000.
Another clue says "Now she's in the Strictly frame. Can this lady stand out from the pack?", alluding to Riley's work on You've Been Framed and Emmerdale.
Strictly kicks off its tenth series on Saturday, September 15 at 6.30pm on BBC One.
Strictly 2012 Judges & Hosts - Pictures: