The couple have been dating for a month but it looks like Ashlee Simpson's romance with boyfriend Evan Ross is getting really serious.

The couple can't stop holding each other hand's as they landed at LAX on Wednesday and they were very affectionate with each other.

The pair also looked like they had coordinate about their outfits. Both wore casual black and grey ensembles.

Ashlee dressed for comfort, sporting baggy grey tracksuit bottoms, strappy black sandals a white T-shirt and black leather jacket.

Her 24-year-old boyfriend looked equally low key in a pair of faded jeans, a black sweater and lace up boots.

Both sported round rimmed sunglasses, with Ashlee toting a large designer black handbag.

The couple were returning from making their first public appearance as a couple at the launch of Jessica Simpson's Fall 2013 fashion line in New York City.

The 28-year-old actress is recovering from her failed marriage to rocker Pete Wentz and relationship with Boardwalk Empire's Vincent Piazza which ended on November 2012.

The sister of Jessica Simpson has just wrapped up a short stint as Roxie Hart in musical Chicago while Diana Ross' son is soon to be seen in the much anticipated Crazy Sexy Cool: The TLC Story. Evan will portray the character of Dallas Austin, who won two Grammys for co-producing the popular girl group's CrazySexyCool and FanMail albums and had a son with lead singer Rozonda 'Chilli' Thomas in 1997.