Demi Lovato invites Ashton Kutcher and Mila Kunis to Wilmer Valderrama's surprise party

Demi Lovato made sure her boyfriend Wilmer Valderrama had a 35th birthday party to remember on Thursday. The 22-year-old Let It Go singer threw her actor love a surprise party attended by his former The 70's Show co-stars Ashton Kutcher and Mila Kunis.

The shindig was held at Palms Thai in Los Angeles, with a shocked Wilmer arriving at the restaurant to find around 40 of his friends waiting to celebrate his special day.

"Wilmer got there later," an eyewitness told Us Weekly. "Giving his friends a chance to get there first. He was surprised!"

Guests reportedly enjoyed an array of exotic cocktails and dined on Pad Thai noodles, barbeque chicken and soup before giving Wilmer a special cake in the shape of the logo of his production company WV Enterprises.

Videos from the occasion show the birthday boy's friends singing For He's A Jolly Good Fellow, led by Ashton and Mila.

The couple, who first met on the set of That 70s Show in 1998 but didn't begin a relationship until 2012, fully entered into the spirit of the evening – clearly glad of an evening off from parenting duties.

Ashton, 36, and Mila, 31, welcomed their baby daughter Wyatt Isabelle on 30 September and have been vocal about not wanting to employ a nanny to help them.

The morning after, which was Wilmer's actual birthday, the Florida-born star expressed his heartfelt thanks to all the friends who turned out to celebrate with him.

"IT'S MY BIRTHDAY!!!!" he wrote on Instagram. "Haha!! I was surprised last night by all the people I love!! I felt so blessed to have looked around & truly know that everyone by my side has & will always have my back. I love you! 35, does that mean is cheaper when I go to Disneyland!?"

Demi, meanwhile, paid a sweet photo tribute to Wilmer by posting photos of the duo together from the last five years.

"Here's to many more incredible years together," she captioned the collage. "Happy Birthday my love.... I love you."

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