Arnie caught grabbing ex wife's butt on camera

Arnold Schwarzenegger has seemingly confirmed rumours that he's back with his estranged wife Maria Shriver after he was caught on video grabbing her butt last weekend.

The actor, who was attending daughter Christina's graduation at Georgetown with Shriver, can be seen cupping his wife's behind in the video footage, TMZ.com reported.

The 'Terminator' star has always been obsessed with Shriver's butt since he met her in the '70s and he recently told a story on "60 Minutes" about how he told Shriver's mother her daughter has a "great ass".