AceShowbiz -

Israeli fashion model Bar Refaeli does a Katy Perry on Instagram, that is, kissing a girl, or more specifically her longtime friend Orna Elovitch, right on the lips while holding each other in a tight embrace. The caption, "B & O standing on the grass and k.i.s.s.i.n.g.," did not say exactly where the photo was taken but from the looks of it, it's somewhere outdoors as other people in their swimwears were seen standing by.

The "Sports Illustrated" cover model reveals it was a spontaneous thing as she added the message, "Oops...not planned," to her Instagram post. A few days before, Refaeli posted a different photo of her and Elovitch, but still wearing the same bikini top.

A few months ago, Refaeli also smooched with actor Jesse Heiman in a GoDaddy 30-second Super Bowl XLVII commercial, which also starred NASCAR driver Danica Patrick. The nerdy actor and now her BFF surely make non-conventional kissing partners for the Maxim Hot 100 list topper.

When she's not posing for personal photos on her Instagram, Refaeli is busy showing off her curves in fashion spreads and on the catwalk, including a recent campaign for Passionata's Satine bra and panty collection. The model is also active with her philanthropy, supporting the LGBT community by hosting a beach party last month in Tel Aviv for participants of the city's gay pride parade.