Robert Downey Jr, Hugh Jackman to make cameos in 'Star Wars'?

Hollywood stars Robert Downey Jr, Hugh Jackman and Samuel L Jackson are reportedly set for 'Star Wars Episode VII' cameos.

The trio have landed secret roles in the latest installment of the George Lucas-penned franchise after being invited to the set at the Pinewood Studios in Buckinghamshire, along with 'Paul' actor Nick Frost, reported Contactmusic.

It is said some of the actors will be forced to appear in the Disney movie in secret to avoid breaching their contract with various other studios.

"Everyone is clamouring for a set visit and cameo. Sam, Robert and Hugh have all been invited, as well as Nick Frost. Some are hiding their faces just for fun but others have to for contractual reasons," a source said.

"If they're tied to other studios, they're technically not allowed to appear in a Disney film," it added.

While, 'Iron Man' star Downey Jr, 49, and 'X-Men' actor Jackman, 45, have never appeared in the series, Jackson, 65, previously starred in the prequel trilogy as jedi master Mace Windu from 1999 to 2005.