Olivia Wilde; Harry Styles.Photo: Rachel Murray/Getty; Dia Dipasupil/Getty

Olivia Wilde and Harry Styles

After a quiet, romantic summer,Harry StylesandOlivia Wildeare back at work, yet still setting relationship goals.

On Saturday, theBooksmartdirectorstepped out to supportthe “Watermelon Sugar” singer at the launch of his Love On Tour in Las Vegas.

“They seem very serious and happy,” the source adds.

Anthony Pham/via Getty

Harry Styles performs onstage during the tour opener for Love On Tour at MGM Grand Garden Arena on September 04, 2021 in Las Vegas, Nevada.

Earlier this week, a concertgoer toldE! Newsthat Wilde was “so happy and dancing all night” at his concert.

“It was very cute. She was singing along to almost every song and having a good time with the people she was with,” the eyewitness told the outlet.

Wilde was previously engaged toJason Sudeikis, with whom she shares son Otis, 7, and daughter Daisy, 4.

In January,PEOPLE confirmed the couple had begun datingafter sparks flew on the set of their upcoming thrillerDon’t Worry Darling.They’ve since grown close, attending a friend’s wedding in the winter andvacationing in Italyin July.

Sources previously said Wilde struck up a close friendship with the One Direction alum last fall. As they spent time together on and off set, their friendship “quickly turned romantic” and “Their chemistry was very obvious,” said an insider.

“Everyone saw it coming,” the source added. “During breaks, he’s hasn’t been able to stay away and visited her trailer.”

Wilde has also shared her admiration for Styles in the past. She commended the singer’s approach to masculinity toVogue.

“To me, he’s very modern,” said Wilde of Styles, “and I hope that this brand of confidence as a male that Harry has — truly devoid of any traces of toxic masculinity — is indicative of his generation and therefore the future of the world.”

“I think he is in many ways championing that, spearheading that. It’s pretty powerful and kind of extraordinary to see someone in his position redefining what it can mean to be a man with confidence,” she added.

For more on Harry Styles and Olivia Wilde, pick up the latest issue of PEOPLE, on newsstands Friday.

source: people.com