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Ashlee Simpson is definitely looking forward to becoming an aunt—again!

But Jessica Simpson's little sister isn't the only one excited about the fashionista's pregnancy.

"Bronx is so excited," Ashlee gushed Thursday at SVEDKA Vodka's '90s Throwback Valentine's Day bash at Pink Taco Sunset Strip.

"Now Maxwell is getting bigger, so now Bronx really gets it and now he's going to have two cousins," Ashlee said. "So we're really happy."

The singer-actress added that Jess is "amazing."

Those Simpson girls sure stick together.

—Reporting by Claudia Rosenbaum