RHONJ Star Teresa Giudice With New Prison Hair Color Beauty Tip!

"Real Housewives of New Jersey" star Teresa Giudice is back home from her 11-and-a-half month prison sentence.

She sat down with Andy Cohen on Bravo's "Watch What Happens Live  One on One" last night.

We only saw about 5 minutes of it, but we caught an interesting beauty tip by Teresa Giudice.

Andy asked Teresa about hair coloring while in prison.
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That was a big deal to the RHONJ star...touching up her roots.

She told Andy that hair dye was available to buy at the prison commissary.

And she raved about her new fave ---Revlon #41--Medium Brown, Color Silk in a box.

Teresa beamed that everyone who noticed her new, lighter hair color fell in LOVE with it.

She's gone about one shade or two lighter than her signature raven locks. Look below how her hair color was BEFORE her prison stint:

You can find Revlon Color Silk #41 here at Walmart on SALE now for $2.50 a box.