Bryce Harper strolled to the plate Tuesday night in DC and Justin Bieber’s “Boyfriend” blared over the speakers. Dan Steinberg speculates Harper lost a bet. Or was the most exciting young player in baseball trying to send a subtle message to someone special? A source* tells us that Harper’s got three other songs he’s ready to surprise the crowd with this summer:

* Sisqo, Thong Song
* Corey Hart, Sunglasses at Night
* Ini Kamoze, Here Comes the Hotstepper

Word on the street is Harper’s saving Gaga – Bad Romance? – for the All-Star game* or postseason.

* Not really.
** Do they even do at-bat music at the All-Star game? I’ve only attended one, and I’ve forgotten if they did or not.

[Video via DC Sports Bog]