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Bust a move, Kate!

Kate Upton is busting out — as a comedic actress!

The famously curvy swimsuit model showed off her bouncy breasts while dancing during filming of “The Other Woman” in Westhampton, LI.

With her low-cut top only barely concealing a yellow-lace bra, the 20-year-old sexpot was joined by co-stars Cameron Diaz and Leslie Mann for the party scene, in which the trio frolicked and giggled on a beach while chugging wine Thursday.

The comedy, due out next year, is about a woman (Diaz) who plots to get even with her boyfriend after finding she’s not his only lover.