Ashlee Simpson's experience of co-parenting with Pete Wentz has been "amazing".

Ashlee Simpson has a good co-parenting relationship

Ashlee Simpson has a good co-parenting relationship

The 39-year-old star has son Bronx, 15, with her ex-husband, and Ashlee and Pete have managed to maintain a good relationship since their split.

During an appearance on the 'Broad Ideas with Rachel Bilson and Olivia Allen' podcast, Ashlee shared: "Co-parenting has for me been amazing. Pete's a great guy."

Asked if she's won the "co-parenting lottery", Ashlee - who was married to Pete between 2008 and 2011 - replied: "Exactly! That's what I was just about to say. Won the co-parenting lottery."

Evan Ross, Ashlee's husband, also has a good relationship with her eldest child.

She said: "I feel like also we started when Bronx was two and a half so he didn't know different."

Meanwhile, Ashlee recently revealed that herself and Evan make a concerted effort to keep their romance "alive and fresh".

The singer and Evan, 35, will celebrate their tenth wedding anniversary in August, and Ashlee admitted that they're already looking forward to the landmark occasion.

She told PEOPLE: "We have big things coming up at the end of the year. It's our ten-year anniversary, I turn 40, my son turns 16."

Ashlee and Evan have found different ways of keeping their romance "fresh" over the years.

The singer - who also has Jagger, eight, and Ziggy, three, with her husband - shared: "We always celebrate and have the best time, but I feel like it doesn't have to just be that day. It's finding those moments, which my husband's so good at.

"I feel like if we haven't had a moment, [he'll] take me to a hotel or [if] we've been in kid land, he'll surprise me with a nice together alone moment, which is nice."