She was one of twelve bridesmaids for her big brother Blaine's wedding to Carson Massler. The two tied the knot in Kentucky last October.
The bridesmaids wore coordinating cream-colored J.Crew bridal gowns, with Lawrence, 23, opting for a strapless version.
As for wedding bells in her own future, Lawrence has been dating her “X-Men” co-star Nicholas Hoult, but for now, they are taking it slow.
A source told UsWeekly.com, "They are doing amazing, but not engaged. They are looking for the next step, but that will happen when her life gets a little less crazy, for sure."
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Oscar-winning actress Jennifer Lawrence looked lovely as a bridesmaid on the cover of Martha Stewart Weddings' special issue, Real Weddings.