Jagger was photographed chatting with London games chief Sebastian Coe at the stadium on Monday evening.
He's not the only A-lister to attend the games, but most are keeping a low profile.
Former U.S. Secretary of State Condoleezza Rice was spotted at the Olympic Stadium Tuesday. Billionaire Bill Gates has attended events including table tennis and beach volleyball.
The London games have also drawn a healthy sprinkling of royalty, with Prince William, his wife Kate and brother Prince Harry popping up at everything from equestrian to swimming to gymnastics.