It's only April ... but bikini season is officially underway ... so sayeth Johnny Manziel's smokin' hot fiancee, Bre Tiesi.
Bre did a little bikini modeling at Posh Shop in L.A. -- showing off her insane physique.
Johnny and Bre got engaged back in March and no wedding date has been set -- but here's one lady who clearly doesn't need any of those bridal boot camps.