'True Blood' star Evan Rachel Wood is known for being an edgy actress. But did you know she can sing, too?

She has had roles in musical fare like 'Across the Universe,' and once covered Justin Bieber, but Wood is largely celebrated for her acting work. However, the new mom totally blew our minds when she belted out 'What's Up,' the smash, '90s alt rock hit by 4 Non Blondes, at an event in Los Angeles.

In case you need a memory jog, the band was lead by Linda Perry, who reinvented herself as a songwriter for Pink and Christina Aguilera through the years.

ERW, looking cute in menswear chic with black pants and a red blazer, the latter by Moschino, was accompanied by piano playing while she roared through the song.

The song has some big notes and Wood hit 'em all. We're totally feeling it.

Oh '90s nostalgia is back and in a big way. Evan Rachel Wood reminded us of that.