It ain’t over until the fat lady sings -- or, in Derek Hough’s case, until you break a toe. After suffering an injury during practice Monday night, it looks like the “Dancing With the Stars” fan favorite may have to drop out of Season 20 of the hit ABC series. (We know! We’re devastated, too.)

"It sucks. It's unfortunate,” Derek’s friend and fellow “DWTS” competitor Mark Ballas told E! News. Sources revealed that while rehearsing with Maria Menounos for the show’s 10-year anniversary special, Derek broke a toe, sprained his ankle and suffered ligament damage.

"Hopefully he's going to be OK. The MRI results will come in [today] probably and we'll know more, but we're just praying that everything's OK,” Mark said.

While Ballas keeps his fingers crossed for his bud, pro dancer Sharna Burgess is sending out good vibes to Derek’s partner, Nastia Liukin.

"Nastia, my heart goes out to her," the competitor said to E! News Tuesday night. “And for her to now have to change pros, it's like changing a language, changing a connection and changing trust. It's really difficult. She's incredibly talented, I know she will handle it beautifully, but it's not fun."

Fortunately for the Olympic gold medalist, she’s no stranger to switching partners. Due to her and Derek’s hectic schedules -- she takes classes at New York University and he's performing in Radio City Music Hall's "New York Spring Spectacular" -- Nastia regularly practices with troupe member Henry Byalikov.

"He's great,” Nastia said of her substitute partner on the show. “But it’s definitely different than dancing with Derek.”

Although we’re hoping that Derek’s MRI allows him to continue in the 2015 competition, we're also interested to see what the judges would say about Nastia dancing with a new partner. On Monday night's show, judge Julianne Hough criticized the performance by her brother and Nastia.

“I feel like there’s a disconnect in your bodies,” she said following the duo’s Week 6 tango. “Like Derek was smooth and you were a bit bumpy. I felt like you didn’t connect together as a couple.”

Perhaps Nastia's new partner, whoever that may be, will have a spark Julianne can’t complain about!

Do you think Derek Hough will continue in the Season 20 competition as Nastia Liukin’s partner? "Dancing With the Stars" airs Monday nights at 8 p.m. EDT on ABC.