Rob Gronkowski Dances His Face Off With Lakers Girls and Venus Williams

The newest Laker Girl is ... GRONK?!

Yep, the (ex?) NFL superstar hit the court at Staples Center on Tuesday night to join the Laker Girls with Venus Williams and James Corden ... and it was ... something!!!

There were high kicks, hip thrusts and some booty poppin' ... and LA's home crowd LOVED IT!!!

If we had to guess, seems the routine was all for a bit for Corden's "The Late Late Show" ... because why the hell else would this happen?

One person who was (sorta) impressed? Rob Gronkowski's girlfriend Camille Kostek, who used to cheerlead for the Patriots.

"Still deciding if I’m a proud girlfriend over this," Camille said. "Nevertheless .... this is an EPIC #NeverNotDancing moment I am proud to witness by Mr James and Robert James I LOVE YOU BOTH"

The wild show capped off an eventful day for Gronk ... 'cause just hours before he broke it down at Staples Center, he announced he was staying retired this season and opting to party instead.

As for how the Lakers fared with the 6'6", 265-pound beast rootin' them on ... they kicked ass, beating Oklahoma City, 112-107.