Adrienne Maloof is missing some very important bling!

On Monday, the Real Housewives of Beverly Hills star ran errands with her two sons and skipped out on a major accessory: Her wedding ring from Dr. Paul Nassif. This week's outing was the first time Maloof, 50, has been spotted publicly since 50-year-old plastic surgeon Nassif's July 30 separation filing.

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Filing papers on the same day RHOBH was set to wrap its third season, Nassif filed for legal separation and requested joint custody of the couple's boys, Gavin, 9, and 6-year-old twins Colin and Christian.

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Married 10 years, the couple -- who frequently bicker on camera when filming Bravo's reality hit -- are going to counseling to try to mend their bond.

VIDEO: Inside Adrienne & Paul's "volatile" marriage

"They are getting professional help and trying to save their marriage," an insider tells Us Weekly of the sought-after surgeon and his wife, who is worth an estimated $300 million as an heiress to the Palms hotel and casino. "But their relationship is very volatile. They are trying to do what's best for their kids."

Insists the source: "It's not a vindictive 'I hate you' situation. No one was cheating. They grew apart."

This article originally appeared on PIC: Adrienne Maloof Not Wearing Wedding Ring