As ABC's hit dancing reality show, 'Dancing With the Stars' premiered on March 16, fans are holding their breath as speculation grows rife on the celebrity names involved in the show. The show is in its 20^th season this year and as is the case every year, the rumor mills are running overtime with regards to which celebrities will make an appearance this time around.

Prominent environmentalist and radio host Robert F. Kennedy Jr. is one of the names that keeps coming up in the rumor circles. Kennedy Jr happens to be the son of US Attorney General, Robert Francis "Bobby" Kennedy. Robert currently co-hosts 'Ring of Fire.'

Comedy star, Roseanne Barr made it clear that she would love to be on the show through one of her tweets recently. This would imply that she was definitely called on. She tweeted, "I am thinking about being on dancing with the stars - bc Im a great dancer and I am getting old - who knows how long I can still do a backbend?"

Even when the celebrity roster has not yet been unveiled by the show, DWTS executive producer, Rob Wade, in a statement given to "People" made it clear that Derek Hough and Cheryl Burke would certainly not be appearing this season. The world class dancers have a massive fan following all over the globe. Wade also stated that he had called on Anna Trebunskaya, Tristan McManus, Kym Johnson, and Louis Van Amstel to join the star studded cast.

Coming back to celebrities, Disney's Ross Lynch and Chris Soules from "The Bachelor" are rumored to make their presence felt on season 20 of 'Dancing With the Stars.' Another big name that has been dancing around rumor circles comes from the NFL universe. It's none other than Super Bowl star, Malcolm Butler. Apparently, talks are on with the Patriots management who could be worried about Malcolm getting injured as a consequence of his participation.

However, the biggest draw on the show would be Hollywood heavyweight, Jack Nicholson. The Oscar winner has expressed that he is a fan of the show, but would "think about it." The seventy seven year old veteran is scheduled to host Saturday Night Live on its 40^th anniversary special on NBC this week.

The DWTS cast will be made official on Feb. 24 through an announcement that will be made on the Good Morning America show.