Sienna MillerSienna MillerThere we were, wondering why we haven't seen much of Jude Law and Sienna Miller recently when out they pop for a night of culture... with Sienna's mum, Jo.

Who says three's a crowd?

The couple were in New York for the opening of the Metropolitan Opera, but were careful not to be photographed together.

Sienna's mum was well positioned between the two lovebirds - denying photographers the pic they all wanted.

Ms Miller locked arms with her mum as they walked the red carpet and happily chatted away with Jude.

Take a look at the happy threesome in the gallery above.