Bradley Cooper joins Lady Gaga live on stage in Vegas!

This will heat up a cold day for you.

They wowed audiences in "A Star Is Born" on the big screen.  This weekend Lady Gaga and Bradley Cooper did it again, this time live on stage in Las Vegas.

Cooper surprised the audience at Gaga's Vegas show during her residency there by walking on stage and singing their Oscar nominated hit "Shallow" together.

Are these two hooking up? Because they share chemistry that is off the charts!  Watch and enjoy here:

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