You may not have heard of her, but you will certainly be familiar with her large body of work. Tara Strong is a prolific voice actress and well known for her work as Bubbles of The Powerpuff Girls, as well as a number of other roles. She has done voice work on Rugrats, Ben 10, Teen Titans, and My Little Pony, amongst many others. She's also the singing voice of Meg Griffin on Family Guy and has played other characters on the show, too.
It's not just the TV and film industries that Strong works in - she also does voice work for video games, including the Metal Gear Solid franchise, Final Fantasy X, Batman, and Ratchet and Clank. There's basically no type of voice work Tara Strong hasn't done! We can't believe we had never heard of her.