Mike Comrie Hilary Duff Luca Comrie Mercedes G-Wagon separated divorce split couple marriage

We guess they really are best friends!

Despite announcing their separation last week, estranged couple Hilary Duff and Mike Comrie were spotted driving together in Mike's SUV after a family brunch on Sunday. We don't know how they do it -- but we are impressed that the duo can remain such good friends in lieu of their split!

On Friday, the former Disney star and the retired hockey player announced they had split after three years of marriage.

"Hilary Duff and husband Mike Comrie have mutually decided to an amicable separation. They remain best friends and will continue to be in each other's lives. They are dedicated to loving and parenting their amazing son, and ask for privacy at this time," her rep said in a statement.

The former lovebirds wed in August 2010 and welcomed son Luca in March 2012.