Toni Garrn, Leonardo DiCaprio, Naya Rivera, Big Sean

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Summer lovin' happens so fast.

Sure, we're expecting some star-studded weddings and big-time babies to be born in these upcoming warmer months, but the still-heating-up romances are something we'll totally be on the watch for!

Check out the five celeb couples who might just make you sweat this summer. (And don't forget to wear sunscreen!)

Toni Garrn, Leonardo DiCaprio


1. Leonardo DiCaprio and Toni Garrn: Another day, another gorgeous model for this Great Gatsby star? Leo, 38, seems pretty infatuated with this 20-year-old Victoria's Secret beauty. "They've been getting quite close over the last week," a source recently told the New York Daily News. "There is definitely chemistry there."

Sophie Monk, Sam Worthington

2. Sam Worthington and Sophie Monk: We reckon these glossy Aussies might go from cute and coy friends to courageous full-blown couple as the temperature heats up. Although the model recently told Express she and the Avatar hunk were "very close, but not dating," he sure looked happy to see her at the airport earlier this month!

Zoe Saldana, Marco Perego

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3. Zoe Saldana and Marco Perego: The Star Trek Into Darkness beauty and her Italian artist beau are still in the early stages, but a source recently told E! News Zoe "is super happy right now." And from the looks of their steamy makeout sesh in Capri earlier this week, these two won't let a little sand and sweat keep them from getting closer.

Big Sean, Naya Rivera

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4. Naya Rivera and Big Sean: This Glee star and her rapper boyfriend only made their public debut as a couple last month, but there's a strong attraction between the musical duo. When radio station Power 106 asked Big Sean to tell "the name of the hottest girl [he's] ever been with," he answered, "Maybe it's, uh, Naya. Maybe Naya." Kissing and telling may not be totally cool, but telling the world how beautiful you think your girl is seems like a surefire way to move a relationship forward.

Chris Pine, Amanda Frances


5. Chris Pine and Amanda Frances: Sorry Trekkies, looks like your dude's got a lady. Chris and his last model girlfriend recently split, and since then he was spotted holding hands with Amanda Frances, also a model, earlier this month. A source tells Us Weekly Chris "is very attracted to her," and that he and Frances "are having a good time."

And to all the Sandra Dees and Danny Zukos out there, here's hoping you find your hot romance this summer, too!

PHOTOS: Check out these stars' sexy bikini bodies

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