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Summer's almost over, but don't tell Charlize Theron!

The smokin' hot actress left Tuesday night's HTC Serves Up NYC Bash looking as sexy as ever in a mint green mini and strappy metallic sandals.

Charlize got to the party around midnight and was flanked by three bodyguards, according to E!. Also in attendance? Leighton Meester, Elizabeth Olsen and Olivia Wilde.

Olivia was just linked to Ryan Reynolds this week after The Change-Up co-stars were spotted having lunch at NYC's Sant Ambroeus restaurant. Back in July, Charlize was said to be dating Ryan.

It's a small world after all!