Mila Kunis and Ashton Kutcher joined Demi Lovato in surprising her boyfriend Wilmer Valderrama on his birthday Thursday in what turned out to be a That 70s Show reunion of sorts. The party was held at Palms Thai restaurant in Hollywood.

Demi Lovato arranged the surprise for her long time boyfriend, who expected a quiet dinner–not a group of friends that included former costars Mila Kunis and Ashton Kutcher.

“He was laughing and saying that he had expected a quiet dinner,” a source told People magazine.

The source added that Wilmer Valderrama was clearly surprised.

Ashton Kutcher and Mila Kunis “looked cute” while they enjoyed an evening away from new baby girl Wyatt. The entire group enjoyed family-style Thai food and drinks amidst lots of talk and laughter.

Demi Lovato presented Valderrama with a birthday cake emblazoned with a giant ‘W’ and ‘V,’ as the whole gang sang “Happy Birthday.”

IT'S MY #BIRTHDAY!!!! Haha!! I was surprised last night by all the people I love!! I felt so blessed! I love you! pic.twitter.com/URMw7rfoPV

— Wilmer Valderrama (@WValderrama) January 30, 2015

“They clapped and cheered when Wilmer blew out the candles,” the source said of Mila Kunis and Ashton Kutcher. “They acted very down to earth.”

Following “Happy Birthday,” Ashton led the whole group in singing “For He’s A Jolly Good Fellow.”

“Ashton and Mila looked cute,” the source added. “They seemed to have the best time.”

Ashton Kutcher & Mila Kunis party with their former That '70s show co-star Wilmer Valderrama.. http://t.co/Qv1KZdNoOg pic.twitter.com/4HCuFQRvPU

— HELLO! (@hellomag) January 31, 2015

Even though it was Wilmer Valderrama’s birthday, it certainly seems like all eyes were on Mila Kunis and Ashton Kutcher. Maybe onlookers were hoping for a glance at their new baby.

It sounds like the new parents were enjoying a much deserved night out sans little Wyatt instead.