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Teresa Giudice, Real Housewives of New Jersey

Charles Sykes/Bravo

Teresa Giudice is ready to toughen up!

As the Real Housewives of New Jersey star prepares to begin her 15-month sentence at Danbury prison, the 42-year-old is working on her family and, most importantly, herself.

"She has been working out every day. She knows that where she's going, it's no joke," a source told E! News. "Physically, she's getting as strong as she can. It also helps her mentally, with the stress."

The Jersey mother-of-four is also enjoying a few luxuries she won't be able to enjoy in prison.

"She's always in full hair and makeup, eyelashes, the works," the insider dished. "She recently admitted that soon she won't be able to get all dolled up, so she's enjoying it now."

Watch What Happens Live, Teresa Giudice, Joe Giudice

Charles Sykes/Bravo

Despite the uncertain future ahead, Giudice has been able to find happiness with her family. In addition to celebrating Halloween with her girls, the cookbook author also recently enjoyed her 15th wedding anniversary to Joe Giudice.

Another highpoint in the famous household is Gia's blossoming music career. The 13-year-old and her girl group 3KT recently released a music video that included a cover of Britney Spears' hit single "Circus." As it turns out, the performance could be the start of something very encouraging for the Bravo star.

"They're very excited about it," an insider shared. "Teresa especially wants to make sure the girls have positive things to focus on while she's gone."

Earlier this week, Teresa appeared on the Real Housewives of New Jersey reunion where she hinted to host Andy Cohen that this could be her final season with the cast.

"You're gonna make me cry, Andy," she emotionally shared. "This is probably going to be my last reunion." And while Cohen assured fans on Reddit that no decisions have been made on the family's future with the show, those closest to Teresa say she's already thinking about her post-jail career.

"Friends are telling her that when she gets out, she'll be bigger than ever. She'll probably make more than ever, too," the source shared. "She'll make a fortune doing interviews and, fingers crossed, writing a book."

Teresa is expected to surrender by January 5, 2015.

(E! and Bravo are part of the NBC Universal family)