It's official: Ashlee Simpson and Evan Ross are a couple

Dating rumors have been circling for almost a month and now it seems it's official — Ashlee Simpson and Evan Ross are a couple!

The pair were spotted attending an event together in New York City on Tuesday.

Diana Ross' son accompanied Simpson at the launch of the Jessica Simpson Fall 2013 Campaign, which she was presenting at the hot spot Above Allen.

The pair were spotted holding hands and happily posed for a loving photograph together.

Simpson was first spotted with her beau at the beginning of July, which immediately caused the rumor mills to turn that the pair were romantically linked.

The stars had previously been photographed as they were leaving Teddy's nightclub at the Roosevelt Hotel together on July 1, which was followed by lunch the next day in West Hollywood.

A source told Us Weekly, "Evan and Ashlee have been friends for a really long time, probably 10 years."

"They know each other from the club scene and have tons of mutual friends."

Their friendship has now changed into romantic chemistry and a source close to Ashlee Simpson told Us Weekly that she is dating Ross.

"It helps that they were friends first. They have a long bond," the source said. "They already know each other really well."

On the eve of the Jessica Simpson Fall 2013 Campaign, the new couple looked happy and relaxed, with Ashlee Simpson wearing a pretty turquoise dress and Ross, a gray suit jacket over a deep V-neck shirt.

Congratulations to the happy couple. We hope this is a relationship that will last (unlike Ashlee Simpson's marriage to Pete Wentz)!

Photo credit: Ryan/WENN.com