If you're Margot Robbie, it's none of the above. In fact, the Suicide Squad star takes days – sometimes weeks – to text the royal back.
Robbie revealed her very important phone contact in an interview with E! News. She was first introduced to the prince by her Suicide Squad co-star (and royal pal) Cara Delevingne.
"They've know each other for years, and we met through friends," Robbie said.
Although, when they first met, at Suki Waterhouse's housewarming party, Robbie didn't recognize Harry, and thought he was another famous ginger-haired Brit instead: Ed Sheeran.
"He got really offended," she told Jimmy Fallon back in March. She tried to defend herself, saying: "He wasn't wearing a crown though! Like, I don't know it's a prince!"
Clearly, Harry didn't hold it against her, nor does he begrudge her delayed responses to his messages.
"He's pretty quick on text actually," Robbie told Extra. "Unlike me – I write back four days later, weeks later sometimes."
And no, she's not playing hard to get: Robbie lives with her boyfriend Tom Ackerley in London.
And if she's going to keep living in the city, she might want to brush up on her royal knowledge – mixing up Harry is one thing, but she wouldn't want to run into the Queen and mistake her for Helen Mirren!
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