Well.. not publicly! I'm sure quite a few are going on behind the scenes.
Will and Jada Pinkett-Smith also comes to mind, since they've been talking about their open marriage. Not quite the same
Good for them tbh
She did a whole song titled "Girls" about being into women a few years back. It even received criticism cuz some people thought the lyrics gave performative bisexuality vibe
You never see polyamory in celebrities