The famous friends met up for an impromtu evening meal, after bumping into each other at swanky Parisian eatery, L'Ami Louis.
Kate was in the French Capital after taking a sneaky break from filming new flick Something Borrowed and jetting in to watch Muse front man Matthew's stadium gig.
The shy pair were later spied taking a romantic stroll through the Parisian streets.
Meanwhile, Renee Zellweger was in town to spend some time with her beau Bradley Cooper, who is on movie-duty in Europe promoting the new A-Team flick.
Coincidentally, both A-list couple chose to dine in the upmarket French eatery on the same night, and when they realised, the famous friends decided to combine tables and have a good old Hollywood chinwag.
The couples reportedly gossiped until the early hours, moving on to a bar at the upmarket hotel Plaza-Athenee.