From left: Ashton Kutcher, Mila Kunis, Wilmer Valderrama and Laura Prepon
Courtesy Wilmer Valderrama
04/18/2012 at 05:45 PM EDT
Former costars Ashton Kutcher
and Mila Kunis
have been spending some friendly time together
recently – and now the pals have added more former That '70s Show
costars to the mix.
On Monday, Wilmer Valderrama Tweeted a sneak preview
of the anticipated reunion, writing, "Yep ... It happened."
Joining him, Kutcher and Kunis for the get-together was costar Laura Prepon.
A source tells PEOPLE that the mini-reunion is expected to air as part of Fox's 25th Anniversary special this Sunday. And according to an EW.com report
, castmembers from In Living Color
and Married...With Children
are expected to appear on the April 22 show, as well.
As for Kutcher and Kunis, who were photographed furniture shopping in L.A. recently, a source tells PEOPLE, "They have been friends for years."