“I don’t know if I’m going to go and see him that day, just because I have to check my girls’ schedule,” Teresa, 44, told E! News Sunday at the Mohegan Sun Resort & Casino’s 20th anniversary party in Uncasville, Connecticut.
As for what the couple has planned to celebrate the big day?
“He said he had a surprise for me, and that he wrote me a song,” Teresa said. “I gotta pitch it out there: He wants John Legend to sing it to me. So, we’ll see. You never know!”
The Bravo star says she visits Joe regularly in prison and the often communicates with her longtime love through sweet notes.
“I send him cards all the time,” she said. “He’s sending me a special card, too. I can’t wait to get it!”
“We’re going to be married 17 years … and I can tell he’s really into me still, which is a good thing!” she added. “I guess I’m doing something right. I can’t wait for him to come home and he can’t wait to come home, so obviously we’re doing something right.”
RELATED VIDEO: Teresa Giudice Says Husband Joe Has Lost 35 Lbs. in Prison by Doing ‘1,000 Sit-Ups a Day’
Teresa recently revealed to PEOPLE that Joe has been working out hard during his incarceration and is already down 35 lbs.
“He’s running, he’s doing 1,000 sit-ups a day,” she explained. “So he lifts weights and that’s what he’s doing. Just running, working out and then a lot of push-ups and sit-ups.”
“I said [to Joe]: ‘Just get your mind and body in check. It’ll be good for you,’ ” Teresa said. “He’s been through a lot with losing his dad and then me gone, it’s a lot.”
The Real Housewives of New Jersey airs Sundays (8 p.m. ET) on Bravo.