Casper Smart is making his way from one A-lister to the next!

An insider tells Life & Style that Jennifer Lopez's ex-boyfriend, 29, recently ran into actress Jennifer Garner on the Warner Bros. lot in Burbank, Calif.

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"He asked Jen out for coffee and wanted to exchange numbers," the source shares.

casper smart jennifer garner getty images

But, in case you didn't remember, J. Lo, 47, was previously engaged to Jen's estranged hubby Ben Affleck, so the whole exchange left her feeling extremely awkward.

The insider explains that Jen, 44, politely let him down, "telling him she was very busy working on a number of projects and being a full-time mom to three young kids."

For more info on your favorite celebs, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for a look back at J. Lo and Casper’s cutest photos.