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Felicity Huffman[1] ain't letting probation life slow her down ... especially when she's got a classic Porsche.

The "Desperate Housewives" star and her hubby William H. Macy[2] were spotted riding around town Friday in his classic Porsche. He was behind the wheel while she enjoyed the comfort of riding shotgun.

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If nothing else ... Felicity seems content with putting jail life behind her as she moves on to the next phase -- probation. As we previously reported ... Felicity and William were spotted last week[3] heading into a downtown L.A. building to meet with her probation officer.

The visit, of course, came on the heels of her getting outta jail[4] after serving 11 days behind bars at FCI Dublin in Northern California for her role in the college bribery scandal[5].

As part of her probation ... Felicity will have to log 250 hours of community service.

Read more from our friends at TMZ