The trio are in London shooting a sequel to last year's blockbuster movie, Sherlock Holmes. The as-yet-untitled new film will be released the 16th december 2011.
Downey, Law and Madonna's ex were on hand to watch the fight of the night between Michael Bisping and Yoshihiro Akiyama.
Bisping, one of the top UFC fighters, got the decision and won.
Other photos here from Jast Jared: http://justjared.buzznet.com/photo-gallery/2487844/robert-downey-jr-jude-law-guy-ritchie-ufc-02/