Ashlee Simpson and Evan Ross Open Up for the First Time About Baby Daughter Jagger After Birth

Jessica Simpson's sister spotted on the red carpet after pregnancy with second child

For new parents Ashlee Simpson Ross and Evan Ross, date nights are sparse but their home is full.

In an exclusive interview with E! News, the married couple dished on their brand new baby girl Jagger Snow Ross for the first time since her birth at the end of July. The couple looked happy and supportive of one another as they held each other tightly along the red carpet of the Guitar Hero Live Los Angeles launch at the YouTube Space LA Monday night. While it's been less than three months, Simpson told E! baby Jagger is already a big talker—perhaps the reason why the beaming parents can't get a full night's rest. 

"No, not yet!" said the pair when asked if they were sleeping. This marked the sleepy duo's first red carpet appearance together since their bundle of joy arrived. 

In addition to baby Jagger, Simpson also has son Bronx Mowgli Wentz with ex-husband Pete Wentz. The 31-year-old songstress spared every detail when it comes to her son's relationship with his new baby sister.

"Knox is such a good older brother," mom said of Bronx multiple times. "He's always saying how beautiful she is and wanting to hold her." She added that he is always willing to entertain the newborn.

"He was just dancing for her last night," she added. "He loves Pharrell!" Sounds like little Bronx has good taste in music!

Jagger Snow Ross ! Everyone!!!!! Everyday has been the best day!!! such a wonderful blessing. Love you @ashleesimpsonross best mommy in the world!

A photo posted by Evan Ross (@realevanross) on Sep 24, 2015 at 10:37am PDT

Despite the 7-year-old's obsession with his brand new sibling, his proud parents shared he loves video games just as much and will probably dress up as a video game character for Halloween. Simpson is even contemplating throwing her son a video-game themed birthday party.

As for her own famous sibling, sister Jessica Simpson, Ashlee enjoys being able to have all the kids visit together, adding that there's a lot of love in their houses now that both women have a boy and a girl respectively. 

While her kids keep her busy, Simpson is starting to budget some time for working off her baby weight with a trainer, adding that she enjoyed her food this pregnancy.

"I'm on a journey," she said, noting she definitely understands other moms' struggles with their post-baby bodies.

Hubby Ross sees no flaws. "You look beautiful!" he told her smiling.

Cue the dove release!  

—Reporting by Lindsey Caldwell