Ashlee Simpson is planning to have another baby soon.

The 30-year-old singer, who recently married the 'Hunger Games' actor Evan Ross, is eager to give her five-year-old son, Bronx, whose father is her ex-husband Pete Wentz, another sibling.

A source close to the blonde beauty told Us Weekly magazine: ''They can't wait [to have a child together].''

Evan, 26, admits he feels surrounded by love since marrying the 'Pieces of Me' hitmaker and the happy couple would love to have a massive family.

He said: ''Now we have two huge families.''

The couple tied the knot in a romantic ceremony held at his mother Diana Ross' lavish home in Greenwich, Connecticut, on August 30.

Bronx already has some experience of being a big brother, as Pete also has two-month-old son, Saint Lazslo Wentz, with girlfriend Meagan Camper.

The Fall Out Boy rocker, who split from Ashlee in 2011 after three years of marriage, previously insisted his eldest son is showing no signs of jealousy.

He said: ''Not at all. Bronx is already planning everyone's Halloween costume!''

He added: ''Meagan is a natural mom. It's amazing to watch her with him.''

Last month, Ashlee's sister Jessica Simpson and her husband Eric Johnson - who have two kids together, Maxwell, two, and Ace, 15-months - were said to be ''working feverishly on having another child''.

An insider said: ''Eric always wanted more kids and he's finally convinced her.

''She realised that the best moments of her life have been with Eric and the kids. She'd be thrilled to announce that another baby is on the way.''