Or maybe they're having a threesome? Or a foursome with Rhys Ifans? Or sixsome with Speidi?
Sienna Miller and Balthazar Getty enjoyed a very public show of togetherness as they shopped in upmarket boutiques in the exclusive Los Angeles coastal suburb of Malibu this week.
The pair spent an hour buying the actress clothes and as they relaxed with a coffee afterwards, Balthazar planted a loving kiss on her forehead.
It comes a day after the actress lashed out at critics over her romance with the married father-of-four.
Friends close to the star have come out in her defence, claiming her relationship with the oil heir began several months after he had secretly split from his wife Rosetta at the end of last year.
Despite reports Balthazar is desperate to reconcile with his wife, sources are also adamant he and Sienna are still an item.
An insider told the New York Post's gossip column Page Six: 'Sienna and he are in love. They are living together in LA. Everyone knows about her and accepts her.
They had reportedly been seeing each other since May, soon after Sienna split from Rhys Ifans
This post is dedicated to the skank-hating sekhmet2 and Bella the Poo Dog