Actor Val Kilmer left a group of costume designers red-faced on the set of his latest movie - by flashing his penis at them.

The incident happened as the Batman hunk was changing for a scene in MINDHUNTERS, leaving embarrassed onlookers with a full view of his private parts.

According to Britain's DAILY MIRROR tabloid, he told them, "Sorry, I forgot my underwear - I didn't come from home."

Designers on the set of the thriller - which also stars rapper LL Cool J and CHRISTIAN SLATER - ordered a member of staff to go and buy the star some underpants.