Nothing like an earthquake to kick off those July 4th celebrations.

On Thursday morning a magnitude 6.4 earthquake shook Southern California,the USGS reported.

Been living in Los Angeles all my life.

Gabrielle Union; Dwayne Johnson; Ava DuVernay

Credit: Gabriel Olsen/FilmMagic; Michael Tran/FilmMagic; Gilbert Carrasquillo/WireImage

That was the longest earthquake Ive ever experienced,When They See UshelmerAva DuVernaytweeted.

But it was loooong.

It was so long I thought for the first time ever Is this the big one?

Dwayne Johnsondidnt seem quite as moved by the quake, but shared his well wishes nonetheless.

We felt a lil movement here in the valley, but all good, hewrote.

Prayers to those in D valley, Bakersfield, S Valley, Kern etc.

Be safe, stay prepared.

Meanwhile, in what is perhaps the days best tweet,L.A.s FineststarGabrielle Unionshared (overshared?)

exactly where she was when she felt the quake.

See more celebrity reactions to the earthquake below.