Sasha Alexander

Is love in the air for Rizzoli and Isles? No, not like that!

On Rizzoli & Isles' Season 4 finale Tuesday (9/8c, TNT), things get playful between Maura (Sasha Alexander) and Frankie (Jordan Bridges) when she tends to his busted lip. But just as he's about to make a move, big sis Jane (Angie Harmon) interrupts them.

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"OK, what's going on between you two?" she asks.

Check out the clip below. Rizzoli & Isles airs Tuesdays at 9/8c on TNT.