The couple had celebrated their six-year anniversary in January
Credit: Josh Hedges/Zuffa LLC/Zuffa LLC via Getty

Demi Lovato just went through an "incredibly difficult" split from longtime boyfriend Wilmer Valderrama, but that didn’t keep her from enjoying her weekend.

The “Cool for the Summer” singer, 23, attended the UFC 199 fight Saturday night in Inglewood, California, in her first public appearance after announcing the break-up.

Lovato was joined at the event with her mother, Dianna De La Garza, and a friend – and at one point she broke into a smile.

The singer and Valderrama, 36 – who celebrated their six-year anniversary in January – jointly announced their relationship’s end on Instagram Friday.

RELATED VIDEO: Nick Jonas Needs Demi Lovato’s Stamp of Approval for All His Dates?!

“This was an incredibly difficult decision for both of us, but we have realized more than anything that we are better as best friends,” Lovato and Valderrama wrote. “We will always be supportive of one another.

“Thank you to everyone who has offered us kindness and support over the years. With only love, Wilmer & Demi.”

The couple began dating when Lovato turned 18, soon after entering rehab for emotional and physical issues.