The soon-to-be mom of three showed up to the Smurfs premiere in Brussels looking part Cinderella, part Smurfette, in a sheer baby blue gown. The dreamy silk and chiffon number was a custom Chanel two-piece,

Rihanna stuns in custom Chanel alongside A$AP Rocky at the Smurfs movie premiere, with her baby bump on designer display.

Rihanna was joined by A$AP Rocky at the world premiere of "Smurfs" in Brussels, Belgium Saturday. Rihanna produced the film and voices Smurfette in the animated reboot that takes the little creatures on a Smurfette-led rescue mission to save Papa Smurf.