The New Kids on the Block star proposed to the blonde beauty last month (Apr14), and the couple is now planning for the big day.
MCCarthy is keen to stretch out the engagement, but likes the idea of making her second wedding ceremony a spontaneous affair - something Wahlberg is very keen on too.
He tells Us Weekly magazine, "I'd like a small wedding. A perfect wedding for me would be Jenny, myself, and our three boys."
MCCarthy adds, "We haven't decided yet... It depends on the day... He's like, 'Now!'. We have, like, 600 family members, so we either spend our entire nest egg on the wedding, or elope and buy a house."
If the two decide on a formal ceremony, they are hoping to persuade Andy Cohen, the U.S. Tv personality who brought them together on his show Watch What Happens Live, to officiate.
Wahlberg says, "We haven't asked him yet. He has to get ordained."