PHOTOS: Dancing With the Stars winners through the years "Long night in the ER with @derekhough nothing worse than seeing a fellow dancer get hurt especially your brother," tweeted fellow pro Mark Ballas, along with a photo of Hough in a wheelchair that he has since deleted (but was captured for posterity by ET)."He can't dance tonight — hurt himself in rehearsals last night," a show source told Us Weekly, and the prognosis isn't looking good for Monday's regular with partner Nastia Liukin, either.According to sources, they have been together since the start of this year, and have been spotted together many times.

Intimate hook-ups & how limo driver blew their cover!

The elder Hough has been linked to a lot of ladies in his time, probably why poor Reed is being labeled as just a "new hookup" in Us Weekly's words. His history will say yes, but only if you believe that being photographed together constitutes a relationship.

It's likely Elizabeth's fault that he would be linked with nearly every partner after her.

Once people knew he was capable of dating someone and lying about it, it was easy to assume he'd doing the same with all his dancing partners. He's still friends with Elizabeth and the pair caught up over dinner in 2012.

Unfortunately, five-time champion Derek Hough won't be participating due to a last-minute injury, and fellow pro Sasha Farber is dancing in his place, Us Weekly has learned.

The fan favorite pro was supposed to pair up with Maria Menounos and some of his other former partners for the special, which is taping on Tuesday, April 21, but a foot injury following the April 20 performance show sent the 29-year-old to the hospital overnight.

Although the two came really close after that Rumba, they never did lock lips - but this week a full kiss was (or, at least, appeared to be) part of the routine. Last time I failed, basically, so she gave me a chance to redeem myself."So about those rumors of the two hooking up - are they or aren't they?

After their dance, judge Carrie Ann Inaba said, "Wow! but I don’t think you needed the kiss"; and then accused the couple of selling-out. Despite the couple's kisses, near kisses, and being spotted together in early March at a Lakers-Celtics game, Maria's reportedly still dating filmmaker Kevin Undergaro, though the couple hasn't been spotted together in public since January.

As for Hough - he's actually rumored to be dating someone else on the show, Welsh opera star Katherine Jenkins.