'DWTS' Divas! Front-Runner Tinashe Trashes Fan-Favorite Mary Lou Retton

Dancing With The Stars season 27 divas Tinashe and Mary Lou Retton are delivering serious drama both on and off the dance floor!

After last night's Vegas-themed show, Tinashe, 25, scored a 26 out of 30 for her Cha Chan performance to Britney Spears' "Circus" — only two points higher than 50-year-old Retton, who scored a 24 out of 30 for her sexy Samba routine to "Coba Cabana."

The competition seemed to go to Tinashe's head, as an on-set source told RadarOnline.com exclusively that the singer trashed Retton backstage afterwards!

"Tinashe said that she refuses to lose to that 'washed-up woman,'" an on-set source dished to RadarOnline.com.

"Mary Lou was already really upset afterwards because she thought she deserved higher scoring, and Tinashe's drama made it only harder on her."

As fans know, Retton admitted this week that she "has a lot of hardware" on her body after suffering decades of injuries as an Olympic gymnast.

"Mary Lou is a very, very good dancer," a source previously told RadarOnline.com.

However, Tinashe — who infamously dated Kendall Jenner's on-again, off-again boyfriend Ben Simmons — is known for stirring up drama, and will "do anything it takes" to go home with this season's Mirror Ball Trophy!

Aside from Tinashe and Retton, the remaining contestants include model Alexis Ren, 21, Harry Potter actress Evanna Lynch, 27, Smallville actor John Schneider, 58, retired football player Demarcus Ware, 36, author and radio personality Bobby Bones, 38, Fuller House star Juan Pabol Di Pace, 39, and former Bachelorette star, Joe Amabile, 32.