Justin Verlander, Kate Upton Exchange Flirty Tweets

DETROIT (CBS Detroit) Are they or aren't they?

Justin Verlander himself threw some gas on the fire of the debate about whether he and Kate Upton are an item when the normally tight-lipped ace spoke to the supermodel -- right out there in the open.

Does this series of flirty texts mean it's on?

Note that Verlander's little brother Ben even got in on the act, sidling up for some Upton attention of his own.

Also, does Kate Upton really think this is funny?

And for all the non-sports fanatics out there, know that the "joke" Verlander made was referring to an instagram video of himself doing what's known as a karaoke exercise.