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Derek Hough, Mark Ballas

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Oh no, is a Dancing With the Stars fan-favorite' future on the show in jeopardy?!

Professional dancer Derek Hough found himself in the emergency room on Monday night after suffering an injury during rehearsals for the show's 10th Anniversary special, ABC confirms to E! News. Accompanying him on his late-night hospital visit? BFF and fellow pro Mark Ballas, who documented the trip on Instagram.

"Long night in the ER with @derekhough nothing worse than seeing a fellow dancer get hurt especially your brother," Mark captioned an adorable pic of him pushing Derek in a wheelchair. "But he had me @bcjean & @corkyballas there by his side. #fam."

So how severe is Derek's injury? A source exclusively tells us he may have broken a toe, as well as severely sprained his ankle. Our source adds that an MRI is schedule for today to see just how serious the injury to his ankle is.

Derek was rehearsing a special routine for the upcoming anniversary special with former partner Maria Menounos when he suffered the injury. And Maria tells E! News exclusively that Derek hurt his foot after he smashed it on a piece of equipment, and when he went to grab ice to put on it, he fell down the stairs, rolling his ankle. Fortunately, Maria was right behind him and helped Derek out before Mark took him to the hospital. Maria reposted Mark's E.R. photo on Instagram, adding, "ugh Mark when I heard him scream I knew we were in trouble! #fingerscrossed #getbetterfast."

Just before Derek's injury, Maria almost suffered one as well, hitting her head against the dancefloor. Fortunately, she was fine, and posted a video of the scary moment on Instagram. "@menough is back....within minutes @derekhough already injuring me! Lol," she wrote, adding the hashtags "#prayingforderek" and "#hopewecanstilldance."

Partnered with Olympic gymnast Nastia Liukin this season, Derek posted a pic of the gold medalist on Instagram after their performance, writing, "This beautiful girl killed the Tango tonight ! Soooo proud . Notes taken from the judges and if we make it through tonight we are ready for next weeks Charleston."

While he originally intended to sit season 20 out, Derek pulled a last-minute surprise on fans, announcing his return on Good Morning America. But Derek's schedule has been pretty tight, with the dancer balancing his DWTS duties in Los Angeles with his work as the male lead in New York Spring Spectacular in NYC. At least he's racking up those frequent flyer miles?

DWTS airs Mondays at 8 p.m. on ABC.