Fans are already buzzing about Hugh Jackman and Kate Hudson‘s upcoming musical biopic, Song Sung Blue — but according to an insider, it’s got Jackman’s girlfriend, Broadway star Sutton Foster, feeling left out.

“The first thing people wonder when they see Song Sung Blue is, ‘Hey, why isn’t Sutton Foster in this movie with Hugh?’” the insider tells the National Enquirer, noting that Foster, 50, is “the right age, has the right look” and is also an accomplished singer.

“Unfortunately, the vision for this project required that Hugh star opposite somebody who was equally famous,” says the insider, explaining that Foster is widely viewed as more of a “theater star” rather than a movie actress. “You’re starting to see where feelings can get hurt, especially for somebody like Sutton who puts too much importance into her acting and musical accomplishments.”

 <span class="wp-caption-text">Ron Adar / M10s / MEGA</span>

Ron Adar / M10s / MEGA

Song Sung Blue, which will hit theaters on Christmas Day, stars Jackman, 57, and Hudson, 46, as husband and wife musicians Mike and Claire Sardina as they form the Neil Diamond tribute band, Lightning & Thunder.

The flick “was a small movie for Hugh, just a few weeks of rehearsing and shooting and nothing to get bent out of shape about,” says the insider. Plus, “Hugh had wanted to work with Kate for years, even before he and Sutton became an item.”

“Sutton shouldn’t feel left out,” adds the insider. “With a big promotional tour ahead for Hugh and Kate, it’s only going to get worse for Sutton, even if Hugh doesn’t see what all the fuss is about!”

This story Sutton Foster Wasn’t ‘Famous’ Enough to Star Opposite Boyfriend Hugh Jackson in ‘Song Sung Blue’ (Exclusive) first appeared on National Enquirer. Add National Enquirer as a Preferred Source by clicking here.