Ashlee Simpson Says Bronx Can't Wait to Be a Big Brother: 'He's So Excited'

Ashlee Simpson shows off her growing baby bump while leaving the Tracy Anderson studios after a gym session with husband Evan Ross on Wednesday (April 22) in Studio City, Calif.

Earlier in the week, the 30-year-old expecting singer showed her support for Evan, 26, at the premiere of his latest film Just Before I Go.

PHOTOS: Check out the latest pics of Ashlee Simpson

At the premiere, Ashlee revealed that her six-year-old son Bronx couldn’t be happier that the family is expanding.

“He’s excited. He’s so excited,” Ashlee told E!. “He’s excited that it’s a girl, he thinks it’s cute�”the tea parties, she’ll be adorable.”

“He can’t wait. He’s going to be the big brother, be the boss. He’s excited,” Evan added.

10+ pictures inside of Ashlee Simpson and Evan Ross leaving the gym…