Entertainment Tonight ET Online ETOnline.com

Gwyneth Paltrow and her musician husband Chris Martin have gone to great lengths not to be photographed together in public during their eight-year marriage. But during a Coldplay concert last Friday in Miami, Martin ran up into the crowd where his wife was enjoying the concert and very publicly planted a kiss before returning to the stage.

Watch the clip to see how the 39-year-old Avengers actress and mother to Martin's two children appears sweetly surprised by his impromptu PDA!

RELATED: Gwyneth Paltrow on Marriage and Having Affairs