Guess Who This Superstar Singer Is!

It's the 4th of July weekend -- and this star's shining brighter than a "Firework!"

This Santa Barbara-born singer was just another one of the "California Gurls" when she shot to superstardom in the late 2000s with a string of tracks that rocketed her into the stratosphere -- which she actually passed through on a Blue Origin flight with Lauren Sanchez!

And here's another hint ... she also had a long-term relationship with Orlando Bloom, but it looks like their romance is pushing "Daisies!"