"Dancing With The Stars" contestant Noah Galloway was hit by friendly fire while rehearsing with partner Sharna Burgess ... and it's brutal and bloody.

When you consider what the former U.S. Army soldier's been through -- he lost both an arm and leg in the Iraq War -- it's gonna take a lot more than a busted tooth to rattle this vet.

It's hard to watch ... while practicing their routine Sharna kicks him in the face and you hear a tooth hit the floor like it's tap dancing.

Yet Noah -- a total pro -- only has three little words to say about it ... "No Big Deal."

"Dancing With the Stars" pro Mark Ballas' latest move is called packing -- he's leaving his primo penthouse overlooking L.A.'s Miracle Mile ... and hoping to make a bundle.

Our real estate sources tell us he's selling his 3-bed, 3-bath, 1410 sq. ft. loft for $800k ... and looking for a place with a way bigger dance floor. Dude needs more space to jitterbug.

Ballas snagged the place 5 years ago for $679k ... so he won't be walking away empty-handed, if his realtor Andrew Gulyas can get his asking price.

As for where Mark's heading -- we're told he's looking all over L.A., but definitely wants a house instead of a condo.

Hockey Hall of Famer Jeremy Roenick says he desperately wanted to be on "Dancing with the Stars" -- but was forced to turn down the gig because of a major political conflict.

Unclear when Roenick was approached by the ABC show -- but the ex-Philadelphia Flyers superstar says he woulda DOMINATED in the ball room ... telling TMZ Sports, "I woulda been awesome."

Roenick clearly LOVES to get down -- and famously busted out his moves on the ice during his playing days.

BTW -- there's more in the clip ... including an update on one of his most famous beefs. Check out the clip ... Roenick's one of the nicest guys around.

"Shark Tank" star Robert Herjavec has an interesting way of saying goodbye to his "friends" ... by planting a big, juicy wet one on their smackers.

Robert and his "Dancing with the Stars" partner Kym Johnson were leaving Greenblatt's Deli in Hollywood Friday night, where they were full-on kissing.

A coy Robert explains, they're not dating ... they're just friends who dance.

They've actually been very open about their relationship ... people on DWTS all know the deal.

"Shark Tank" star Robert Herjavec has a new asset in his portfolio -- his "Dancing With the Stars" partner Kym Johnson ... and she gets an awesome gift from him if they win.

Herjavec and Johnson met mid-February right before the "DWTS" cast was announced ... and we're told they started dating immediately.

They spent Saturday night at a party in the Hollywood Hills and Monday at Hyde lounge with the "DWTS" cast. Our spies tell us they're very open about the relationship ... lots of making out.

Herjavec has also promised Johnson if they win "DWTS" she'll get one of his Ferraris.

We broke the story earlier this month Herjavec and his wife of nearly 25 years had separated and were heading for divorce.

Things move quickly with Bob.

It looks like an engagement ring ... she's flaunting it like an engagement ring ... but the rock on Erin Andrews' finger is NOT an engagement ring.

Andrews has been dating L.A. Kings superstar Jarret Stoll for a while ... after she posted a pic with that huge diamond before last night's "Dancing with the Stars" premiere, there was buzz that he finally popped the question.

Turns out ... the ring wasn't from Stoll -- it was from wardrobe ... specifically so Erin would look "blinged out" for the big show.

But the ring was no cheap prop -- according to E!, it was a special asscher-cut diamond ring that weighed in at 2.01 carats with 22 baguette diamonds and 88 other microset diamonds.

Michael Sam blew the judges away last night ... at least his ass did ... because the wannabe NFL star's booty was the talk of the ballroom on last night's "Dancing with the Stars."

The dancing was fine. His footwork was sloppy ... but after Sam cut a rug to "Uptown Funk," judges Bruno and Len couldn't stop talking about the junk in Sam's trunk.

Bruno -- "That butt was a work of art. Michelangelo's 'David' has nothing on you."

Len -- "You could win 'Rear of the Year' and I could win 'Ass of the Past.'

With Season 20 of "DWTS" upon us, get swept off your feet with the 18 sexiest shirtless photos Val's teased on social media!

If this is how Carl's Jr. babe Charlotte McKinney plans to rehearse for her upcoming gig on "Dancing With the Stars" -- there's at least a chance we might be interested in that show again.

Hint for the 'DWTS' wardrobe department -- save the bikinis for Charlotte, and keep them away from Redfoo ... at all costs.

Of course, it's easier (and hotter) to just watch her burger spot instead.

"Dancing With The Stars" pro Karina Smirnoff changes fiances as often as she changes dance partners -- partly because dancers lead sexually charged lives ... this according to her latest ex.

Sources close to Jason Adelman -- who announced he and Karina were engaged in January -- say he called things off because she has "different family values." We're told he's not accusing her of cheating, but he was uncomfortable with the way she acted around other men ... especially dancers.

It's not like this was any long term engagement -- he just popped the question in January ... after they reconnected at a holiday party in December. As for his belief that dancers are all horned up people looking to bang -- a rep for Karina says that is "disrespectful and insulting to the entire dance community."

Our Adelman sources add that he feels Karina's track record speaks for itself ... she's been engaged twice before -- to fellow dancer Maksim Chmerkovskiy and MLB pitcher Brad Penny -- but never made it down the aisle. So much for the third time.

Karina's rep also says this is "nothing less than an attempted smear campaign from a malicious person."

For what it's worth ... we're told Karina returned the ring.

With just a couple of weeks until the NFL's veteran's combine, Michael Sam spent his Friday focusing on his footwork ... for "Dancing with the Stars!"

Sam left the DWTS rehearsal studios clutching a pair of ballroom dancing shoes ... and got into a waiting car with his boyfriend Vito.

"Dancing" premieres on March 16. The NFL veteran's combine is March 22.

Question is ... can Sam have his cake and eat it too?

Michael Sam's decision to join "Dancing with the Stars" does NOT mean he's throwing in the towel on his NFL career ... so says his friend Jason Collins who says he can't wait to watch the guy kill it in the ballroom.

Sam's been taking heat from critics who say the decision to join "DWTS" shows he's more concerned about being a celebrity than playing in the NFL.

But Collins -- who famously came out as the NBA's first openly gay player in 2013 -- says the haters are wrong ... and he's got proof to back up his argument.

Michael Sam is adamant ... his decision to join "Dancing with the Stars" does NOT mean he's giving up his NFL dreams ... saying, "Football remains my unquestioned number 1 priority."

TMZ Sports broke the story ... Sam signed on to join Season 20 ... which begins next month.

Some people have said the move is proof that Sam is throwing in the towel on his football career and wants to focus on exploiting his off-the-field fame.

But moments ago, Sam fired back at the critics ... saying, "Football remains my unquestioned number 1 priority, however, while I continue to train and stay ready, I am ecstatic to participate in a fun, athletic competition like so many players before me have done."

"Filming this off-season is very flexible and allows me to be part of the veterans combine 3/22 if accepted or any other workouts."

Michael Sam will be competing in March, not on the football field, but on the "Dancing with the Stars" hardwood ... TMZ Sports has learned.

Michael -- the first openly gay player drafted in the NFL -- will be part of Season 20, which fires up next month.

Here's the problem. Sam -- who insinuated he was cut from the NFL because he is gay -- has vowed to get back in the league and said he'd take part in the first-ever veteran's combine on March 22.

But Sam needs to prove he has what it takes, and we're thinkin' some of the owners might question his commitment if he's focusing on the rumba rather than rumbling.

Rob Gronkowski tells TMZ Sports he's definitely thinking about doing "Dancing with the Stars" one day ... but says he's worried that formal training will RUIN his trademark skills.

Gronk was out in NYC this weekend ... where he broke SEVERAL pieces of big news, including:

-- Did he nail that hot local reporter on Valentine's Day?
-- He's been training teammate Chandler Jones to fight his brother Jon "Bones" Jones
-- He NEVER wants to leave the New England Patriots.

Oh, he also notices our photog is wearing a Miami Dolphins hat ... SO HE SPIKES THE HELL OUT OF IT!!!

Check out the clip -- amazingness.

Derek Hough isn't ready to admit he's banging Kate Hudson -- but he's definitely not denying it either.

The "Dancing with The Stars" pro was in Boca Raton Thursday -- at a Tony Robbins seminar of all things -- when a photog popped the question about rumors he and newly single Kate are hooking up ... and his response is a little weird.

Hough and Huds were reportedly making out at an L.A. hot spot last Friday night -- he left out the front door, and she was spotted sneaking out the back -- sans engagement ring.

So, Derek ... if you're NOT with her ... why not just say so? Just sayin'.