Liam Hemsworth and Miley Cyrus with Adam Shankman (inset)
06/09/2012 AT 04:00 PM EDT
Sure, he acts, dances and directs, but there's yet another talent Adam Shankman can add to his resume: matchmaking.
Shankman was one of the producers of The Last Song
, the 2009 romance that introduced Miley Cyrus
to now-fiancé Liam Hemsworth
, who announced their engagement
"I sort of want a finder's fee for Miley Cyrus and Liam Hemsworth," the Rock of Ages
director told PEOPLE at the film's L.A. premiere Friday. "I cannot tell you. It made me cry."
Shankman saw their relationship blossom when production began for the film that started it all
. "I remember that first day of shooting when they first kissed and Miley walked by my sister [producer Jennifer Gibgot] after they shot the kissing scene," he recalls. "She goes, 'This is gonna work.' "
Shankman attributes the couple's chemistry to their shared passion for life – and all those things that make them different.
"I'll tell you what's so great. That thing about opposites attract," he says. "Their fundamental core values are the same, but he's really mellow and she's really hyper. So it really works together."
Shankman supports the young couple but there is one thing that worries him.
"It's extraordinary, and I'm so happy," he says, adding, "I'm scared at how beautiful those children are going to be."