What’s even more shocking is a rumor that her new man has a huge crush on Demi’s rival Taylor Swift.According to , Luke has been crushing hard on Taylor for years, and it’s possible that Demi doesn’t even know it.

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The new couple celebrated New Year’s Eve together and you can see the cute photo below.

TMZ reports that Demi and Luke split after “things didn’t work out.” He was a fighter for UFC and Guilherme is an MMA fighter.

The 24-year-old singer was spotted on a date with Guilherme on Sunday night (January 1) in Los Angeles and they definitely seemed to be enjoying each other’s company.

Guilherme even posted this photo on his Instagram account with a heart emoji.

There have been rumours going around for a while that Demi might be seeing UFC fighter Luke Rockhold.

Both Demi and Luke Instagrammed a photo of themselves, taken at the UFC 205 fight between Connor Mc Gregor and Eddie Alvarez.

It's slightly more subtle than full-on making out or updating your FB status, we guess, which would be our method for announcing we're dating someone who can double up as our boxing instructor (no more having to pay for a gym.

Demi Lovato is dating UFC superstar Luke Rockhold -- and TMZ Sports has learned it's a romance that's been blooming for a couple months. the 24-year-old singer hit it off with the 31-year-old former UFC middleweight champ earlier this year while training at Unbreakable gym in Los Angeles. we're told the two clicked right away -- and have even sent some secret inside messages to each other on social media ...

There were rumors back in June that Demi was dating Guilherme, but insiders shot it down as a “quick fling.” It seems they have rekindled their relationship!

Things are definitely heating up between Demi Lovato and UFC fighter Luke Rockhold!

They both made that photo black and white, which is a clear sign that it's serious, obviously.