Instead, the laid-back View co-host, 41, is letting her new fiancé take charge when it comes to all the details.
"I trust his style," she told PEOPLE at the opening of The Attic rooftop lounge in N.Y.C. on June 11. "So whatever he wants. All I know is that this is our last wedding and we're going to make it great."
But Wahlberg, 44, who proposed to McCarthy in April, promises he won't go overboard.
"Don't be calling me Kanye West," he jokes about the rapper's over-the-top wedding to Kim Kardashian. "I like Kanye's music, but I don't know about his wedding style. That's a little too much."
One detail the duo already have planned out? Incorporating their new family into the ceremony.
"We have three boys together," says Wahlberg. "They'll be a big part. We're about who's there and what the spirit is more so than where it is and how much money we spend. That's not what it is for us."
Wahlberg tells PEOPLE that McCarthy's son, Evan, 12, has officially moved into their N.Y.C. home.
"I came back from my tour Monday and Evan was there," says the New Kids on the Block singer. "My son's coming next Monday and my dog's there, it's like we're all together for the first time."
McCarthy says that Evan is adjusting well to his new home.
"He's very excited," she says. "He's nervous. But I hope he does find great friends because he's a great kid."