Hillary Clinton was delighted to see Adele endorse her for president at her Miami concert.

Clinton tweeted on Thursday that it was a "wonderful surprise" to have Adele voice her support for her.

Clinton was actually in the audience watching the concert, though it's not clear if Adele knew she was there. The presidential contender did not appear on stage with Adele.

"I do know what to do - don't vote for him, that's all I'm saying," Adele said at her concert, referring to Republican nominee Donald Trump. "I support Hillary Clinton 100%, I do. And for anyone else that wants to vote for him, I don't care, good for you, do whatever you want. I'm just letting you know who I would vote for."

Meanwhile, Trump wasn't exactly thrilled that the Adele-Clinton moment received such a positive response, considering he took time out of his own campaign schedule to promote his new hotel in Washington.

"Hillary Clinton goes to see an Adele concert last night, and everybody says, 'Oh, wasn't that nice, isn't that wonderful'. I can't take one hour off to cut a ribbon at one of the great hotels of the world?" he told ABC News.

Shortly after the concert, Clinton appeared on SiriusXM and said she was "grateful" for Adele's endorsement.

"I went to the Adele concert after we finished our day of campaigning in Florida, and I was stunned and thrilled because I'm a huge fan of hers and it meant a lot to me that she said something so positive," she said.

Clinton previously spoke about Adele in a March radio interview with SiriusXM.

"I'm currently into Adele. That is my go-to voice," Clinton admitted at the time. "I have such a huge admiration for her skills, her abilities and her personality."

Sounds like Clinton might ask Adele to sing at her inauguration if she wins, no?