Ashlee Simpson and Evan Ross

Ashlee Simpson and Evan Ross

Ashlee Simpson's ex-boyfriend is "best friends" with her fiancé.

Ryan Cabrera, who dated the blonde beauty, 29, in 2004 and was the inspiration for her hit 'Pieces of Me,' claims he is thrilled the blonde beauty is marrying Evan Ross, whom he has known since they were children.

The 32-year-old star told UsMagazine.com: "Evan's been one of my best friends, he used to sleep on my couch way back in the day since he was a baby. And then to see him with obviously another friend of mine is great."

He also confirmed that he and Evan, who is Diana Ross' son, have been working in the recording studio together.

He said: "Originally, we were working on his album together, so I was helping him write songs for his record. Then we came up with this one song that just worked right for me."

The couple, who are preparing to get married later this month, were spotted attending Ryan's birthday in Malibu, California in July, and he insists there is nothing strange about their friendship.

He said: "Ash and Ev came to my birthday party. I'm friends with pretty much most of the girls I've dated except for the most recent one because it's a little fresh."

But he admits he isn't sure if he will attend their wedding.

He said: "I don't know, depends if I'm in town."

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