Many celebrities have shared on thing in common, ex-girlfriend and boyfriends, but one that we didn't expect to hear about was Calvin Harris and Bruno Mars' former romance with Rita Ora.

The EDM DJ and "Uptown Funk" singer are both at the top of their game with creating catching hit singles, topping the Billboard charts, but that's not the only thing they have in common. They both used to date the "I Will Never Let You Down" singer, with whom they both broke it off with as well.

According to reports, both relationships ended because of their crazy work schedules, however, other reasons were also involved.

Ora dated Mars when she was 18 and he was 24. This was the time when she hired him to write some tracks for her when she was just starting out. Despite their split, the two have apparently remained close, but the same cannot be said about Harris and Ora after they split a year after they started dating in May 2013.

"It was love at first sight," said Ora at the time to Bravo magazine about Mars.

It appears that both the hit makers have moved on to dating other women. While Mars is smitten with Jessica Caban, Harris is reportedly going around with Taylor Swift.

Swift was spotted cheering on Harris with her best friend Alana Haim at 102.7 KIIS FM's Wango Tango 2015 concert as he took the stage.

After Harris finished his set, the "Blank Space" singer and Scottish DJ were spotted back stage sharing a kiss and holding hands and a source told E! News that the pair left the StubHub Center in Los Angeles together.

"They are cute together. They seem happy," said a source. "They definitely look like they are dating."

Co-cost of Ryan Seacrest's KIIS-FM radio show, "On Air With Ryan Seacrest," Ellen K, stated that an Instagram video posted on the program's page shows Harris and Swift holding hands while walking down the hallway at the concert venue.

This article was originally published on Fashion & Style.