It's the biggest question in Hollywood: "Who will waltz, rumba, and jitterbug on the upcoming 8th season of Dancing with the Stars?"

We're hearing that reality stars Denise Richards and Jackass wild man Steve-O may cha-cha into the line-up.

According to Life & Style Weekly, the 37-year old Richards has already been prepping for Dancing and has lost a few pounds to tone up and get in shape. An insider tells the magazine, "She's super excited and has lost a few pounds to tone up and get in shape. She's ready and thinks she can go all the way!"

Life & Style also says 34-year old Brit Steve-O ( real name Stephen Glover) will join the cast. He shot to fame in 2000 performing crazy stunts on Jackass.

ABC will reveal the cast this Sunday during its primetime line-up. The 8th season of Dancing with the Stars premieres March 9th on ABC with a live, two hour special.