Johnny Bananas is throwing his full support behind CT Tamburello and Phaedra Parks‘ romance … and he should know, since he competed alongside them on “The Traitors.”

We got Johnny in Hollywood on Wednesday … and the reality star, who calls CT a brother, told our photog CT and Phaedra weren’t in a position to explore their relationship while filming the Peacock show … but believes they’ve both since leveled up.

As for whether their romance is real … Johnny says he’s buying it and fully supports the couple. In fact, he joked he’ll be “jumping out of the cake” at their wedding … while acknowledging he may be getting ahead of the game.

Johnny joked Phaedra went from Apollo Nida to Zeus … while CT went from dating OnlyFans creator Catalina White to dating an attorney.

Johnny also weighed in on Dee Valladares‘ performance on the current season of “Big Brother” … and says she’s executing her signature strategy flawlessly.

“The girl does not know when to turn game off,” he told us … accusing Dee of getting rid of the strongest women and manipulating the men to make it to the end.