Reese Witherspoon: Monsters vs. Aliens -- Round 1!

Reese Witherspoon (in Valentino) puts one hand on her hip as she poses with an indestructible gelatinous mass at the premiere of her new animated flick, Monsters vs. Aliens, on Monday (March 9) in Berlin, Germany.

The blob, voiced by Seth Rogen in the movie, is called B.O.B. and stands for Bicarbonate Ostylezene Benzoate.

Monsters vs. Aliens will open in Germany theaters on April 2 and is also voiced by Kiefer Sutherland, Stephen Colbert, Paul Rudd, Rainn Wilson, Will Arnett and Hugh Laurie.

20+ pictures inside of Reese Witherspoon premiering Monsters…