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A very frail Demi Moore braved the rain for a quick visit to a Los Angeles nail salon, and despite the cheating allegations, Ashton Kutcher's wife of six years WAS wearing her wedding ring.

Wearing a knee-length black skirt, short biker boots and a red Kabbalah string on her wrist ... the 48-year-old actress kept her black raincoat over her head while she rushed in and out.

Looks as though the stress surrounding Ashton's rumored affair has taken a physical toll on Demi. We can't help but notice her extremely thin legs.

Wednesday afternoon, Kutcher Tweeted a link to the following life advice:

    "Relationships must be chosen wisely. It’s better to be alone than to be in bad company. There’s no need to rush. If something is meant to be, it will happen – in the right time, with the right person, and for the best reason."

The couple were last seen together last Friday morning while they attended Rosh Hashanah services at LA's Kabbalah Centre.

On the same weekend of their sixth wedding anniversary, Ashton reportedly spent the weekend in San Diego at Fluxx nightclub paryting with buddies ... and is rumored to have had an affair with 23-year-old Sara Leal.