Casper Smart Hey J Lo, This Trip's On Me!! ... Sorta

2/27/2016 11:55 AM PST BY TMZ STAFF

0227-casper-smart-tmz-01Casper Smart could be treating his gf Jennifer Lopez to a romantic trip for two in Saint Martin ... but he won't pay a dime for it. 

Casper was at the GBK Oscar's gifting suite at the London Hotel in LA Friday to rack up nearly $20k in goods. The best item up for grabs? A free trip for two to Saint Martin, the perfect getaway for J Lo during her Vegas show and American Idol judging.

It's unclear if Casper cashed in on the vacay for himself or if it'll go to a friend -- but one thing's for sure -- the best kinda vacations are free.

Side note ... the GIGANTIC bag the kid beside Casper is holding is filled with other freebies, including a $130 3D printing pen and $15 pack of vegan gum.