David and Yolanda Foster: The Marriage Is Over

'Real Housewives' star Yolanda Foster and mega music producer David Foster are calling it quits after 4 years of marriage.

The couple's been together for a total of 9 years, and say, "During that time we experienced love, friendship and the inevitable challenges that come with managing a marriage, careers, blended families and health issues."

The joint statement to is a clear reference to Yolanda's battle with Lyme disease over the last 3 years. Bella and Gigi Hadid's mom and stepdad tied the knot back on 11/11/11. This was her 2nd marriage, and David's 4th.

People first reported the break-up.

It's unclear if either's actually filed divorce papers. They never used the D word in their statement, but added ... "We are grateful for the years we've spent together and believe wholeheartedly that we did our best."