Brittany Murphy has apologised for hinting ex-boyfriend Ashton Kutcher has a small manhood. The sexy actress, who dated the handsome star after meeting him on the set of 'Just Married', revealed Ashton's little secret on a recent US chat show while talking about his relationship with older woman Demi Moore. She said at the time: "I suppose that the crux of their relationship is that, to him, age doesn't matter and, to her, size doesn't matter." But Brittany insists she was just joking and has said sorry to the 'Punk'd' presenter for making the cheeky comments. She said: "My trouble is I talk first and think later. I didn't mean to cause him any offence." Brittany, who has also dated rap star Eminem, recently split from her fiancé, Jeff Kwantinetz, after he admitted he still had feelings for his ex-girlfriend.