Celebrities slammed Donald Trump at Sunday night’s BET awards, warning that the presumptive GOP presidential candidate must be taken seriously — or else.

“I’m really not political, but it’s serious out here,” said Taraji P. Henson, who used her best actress award for “Empire” to tackle the tycoon.

“For those who think, you know, ‘He’s really not going to win’ — think again. So we really need to pull together and turn this country around,” she added.

Usher, who performed his new song “No Limit,” wore his anti-Trump message on his back — a dark green, “Don’t Trump America” shirt.

And show co-host Tracee Ellis Ross made it clear whom she’ll be voting for come November: Hillary Clinton.

“As we all know, we have a very important election coming up. And we all need to vote,” said Ross. “You know what I heard? I heard one of the largest, most influential demographics are single women in this election. So basically, technically, what that means is that I will be determining the next president. Welcome to the White House, Hillary Clinton.”