Jake Arrieta Has Mankini Strip Show To Celebrate Bryce Harper Signing

[[tmz:video id="1_8dl9muri"]] Bryce Harper's having the best Thursday ever ... dude just made $330 million -- AND HE GOT A MANKINI STRIP SHOW FROM HIS NEW TEAMMATE, JAKE ARRIETA!!! Bryce just inked a monster 13-year deal worth around $25 MIL per…