AceShowbiz - Adam Levine admits he "crossed the line" with his flirtatious behaviour - but has insisted he didn't cheat on his wife. Although he's confessed to showing "poor judgement," the 43-year-old pop star has slammed claims made by Instagram model Sumner Stroh that he cheated on Behati Prinsloo.

"A lot is being said about me right now and I want to clear the air. I used poor judgment in speaking with anyone other than my wife in ANY kind of flirtatious manner. I did not have an affair, nevertheless, I crossed the line during a regrettable period in my life (sic)," Adam - who has been married to the model since 2014 - said in a statement on Instagram.

Adam and Behati - who have Dusty, five, and Gio, four, together - recently announced they're expecting their third child. And although Adam has confessed to "inappropriate" behaviour, he's promised he won't repeat his mistake.

He said, "In certain instances it became inappropriate; I have addressed that and taken proactive steps to remedy this with my family. My wife and my family is all I care about in this world. To be this naive and stupid enough to risk the only thing that truly matters to me was the greatest mistake I could ever make. I will never make it again. I take full responsibility. We will get through it. And we will get through it together."

The Maroon 5 star made the statement after Sumner claimed she dated the singer for about a year. She also shared Instagram messages that she claimed were from Adam. Sumner said in a TikTok video, "At the time, I was young, I was naïve and, quite frankly, I feel exploited."

The Instagram model even suggested that Adam wanted to name his third child with Behati after her. Sumner explained, "He said, 'Ok, serious question. I'm having another baby and if it's [a] boy I really wanna name it Sumner. You OK with that? DEAD serious.' "