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But rather than hitting the big screen, 3½-year-old Dolly Rebecca Rose and Charlie Tamara Tulip might be headed for the big stage instead.
“They’re singing songs that they hear on the radio — some songs which I don’t even know, which is odd,” Romijn, 39, told PEOPLE while attending the third annual Veuve Clicquot Polo Classic in Pacific Palisades on Saturday.
“[Their favorite songs are] ‘Call Me Maybe’ and ‘Firework’. They know all the words! I don’t know all the words! I don’t even know how they know all these words … I think they learned them [at camp].”
Despite sharing the spotlight for their duets, Romijn reveals that the twins’ polar opposite personalities are stronger than ever.
“Stylistically they’re very different. Dolly’s the one who gravitates toward everything sparkly, princess dresses, ruffles, bows, hearts, unicorns, you name it,” the actress says. “And so Charlie won’t go there. She sticks with purple pants, boots, she’s really into horses.”
However, could the days of clear-cut closets and split styles be quickly dwindling? According to their mama, the girls recently started staking claim to their clothes!
“As they’re getting older, their style divide is starting to narrow,” says Romijn. “This week was the first time they fought over an article of clothing.”
– Anya Leon with reporting by Gabrielle Olya