Matthew Lawrence tells toofab, "I am devastated. He was the single most important influence in my career and not a day goes by I don't appreciate the time I got to spend with him. My deepest thoughts and prayers are with his family."

Not all "whoas" are created equally.

At least one of Robin Williams' goddamn "Mrs. Doubtfire" kids wants in on the sequel ... Matthew Lawrence tells TMZ he would love to be a part of it!

The Amethyst birthstone meaning for Matthew and all of the February-born fans.