“It happened over the summer,” a source exclusively revels to In Touch, on stands now. “His whole family had come out to California for Mila’s birthday [on Aug. 14], and he did it then.”
Ashton, 35, split from Demi, 51, in 2011; he began dating his former That ’70s Show co-star a little over a year ago. “They couldn’t go public with [the engagement] until his divorce was final,” says the source. “Now nothing should be standing in their way.”
For more, pick up the latest issue of In Touch, on newsstands now.