Star Transformation: Neville Longbottom (Matthew Lewis) is all grown up...

Matthew Lewis, who starred as the lumpy Neville Longbottom in the "Harry Potter" films, has toned up considerably as an adult. A new fashion spread in "Attitude" magazine features photos of the former child actor wearing very little fashion.

Lewis, 25, has reportedly buffed up for a role as an athlete in the film "Me Before You."

His "Harry Potter" character was shy and bumbling at first but ended up becoming a heroic member of Dumbledore's army.

Lewis famously had to wear a padding, false teeth and prosthetics to make his ears stick out as the unassuming Neville.

His rocking bod has even "Potter" author J.K. Rowling taking notice. She referenced Lewis' co-star Daniel Radcliffe's nude turn in the stage play "Equus" in a tweet, saying of Lewis' risque poses: "Warn me next time, for God's sake."