Ashlee Simpson Rossand Ryan Cabrera are proving that exes can be friends.

The singers, whofamously dated in 2004, spent time together over the Memorial Day weekend with their significant others: Simpson Ross’ husbandEvan Rossand Cabrera’s girlfriendAudrina Patridge, whom Cabrera first dated more than eight years ago.

“Ryan is one of my best friends — even before we were together — and he still is one of my best friends of all time,” Ross, 29, told PEOPLE Thursday at the launch of his and Simpson-Ross’ unisex Zadig & Voltaire capsule,Jagger Snow.

“He and Audrina have known each other for a while now, too. He lives so close. We just like showed up for Memorial Day. We had the best time,” Ross said of the time spent with his wife, Cabrera and Patridge.

Courtesy Zadig & Voltaire

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Ashlee Simpson Ross and Evan Ross

It’s been just over a month sincePEOPLE reported that Cabrera and Patridge, who firstcalled it quitsin May 2010, are dating again.

Their reconciliation came eight months after Patridgefiled for divorcefrom estranged husband Corey Bohan, whom shemarriedin Hawaii in November 2016. They share 23-month-old daughter Kirra Max.

Since rekindling their romance, Patridge and Cabrera’s relationship is continuing to go strong. In April, they attendedStagecoachtogether and celebrated the mother of one’s 33rd birthday with a veryspecial getaway to Mexicoearlier this month.

“Audrina and Ryan are getting serious,” a source close to Patridge told PEOPLE this week. “They’re spending a lot of time together and are very happy together.”

source: people.com