Kate Upton's boobs are a magnet for gropers

Kate Upton's breast was recently groped by her friend during a girl's night out.

The Sports Illustrated swimsuit model beamed while a female pal copped a quick feel, during a meal at a Los Angeles eatery, the Sun reported.

In the photo, uploaded to Twitter, another pal looks at what's going on with mock outrage.

The photograph was accompanied with the caption 'Love! @chaneliman @HeidyDelaRosa @lisamariebenson.