Reed and McDonald confirmed earlier this month that they plan to tie the knot after weeks of speculation that McDonald had proposed.
During an interview with Ryan Seacrest on his KIIS-FM radio show, Lutz revealed his happiness over the couple's forthcoming nuptials and confessed that he hopes to be invited to the ceremony.
"I've never seen Nikki so happy and we really got close throughout all these movies. I'm just so happy for her," Lutz explained. "It's great to see, especially in Hollywood, that real lovely happiness or marriage, and I hope I'm invited!"
Reed and McDonald began dating after meeting at the premiere of Red Riding Hood in Los Angeles in April.
McDonald has claimed that he knew Reed was "the one" immediately after they met.