The actor and choreographer helped launch Lay's new Poppables snack chips by choreographing a special dance session in New York City on Thursday, and stopped to talk with ET about his "good" post-breakup relationship with the "On the Floor" singer.
"[We're] friends," Smart said, adding that the exes have "nothing but respect and love for each other."
The 29-year-old performer said he was "of course" happy for Lopez's new relationship, explaining, "I want nothing but the best and love [for her]."
Lopez and Smart, who first sparked romance rumors in 2011, called it quits in 2014. They rekindled their relationship in 2015, before splitting once again in August 2016, and have publicly remained amicable since parting ways.
Before calling things off, Smart went on tour with Lopez as a choreographer and dancer. Reflecting on that experience, Smart shared, "It was tiring but nice to travel around the world in six months, especially with someone you're with and you get to enjoy it together."
"I'm proud to be a part of something so iconic and legendary," Smart marveled. "I just feel blessed to be a part of it… and have such a good time. All the cast and actors, we got super close. We still keep in contact daily."
The original Dirty Dancing turns 30 this year -- a milestone anniversary Smart shares with iconic romantic drama -- and Smart has a few fun ideas for how he might spend his big day on April 6. While he usually "could care less" about birthdays, he admitted the big 3-0 has made him "a little itchy," and he wants to make sure to celebrate the occasion in a big way.
"I might rent out a big restaurant and do a big party thing," Smart said. "Maybe paintball with the guys."