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Hilary Duff, Jason Walsh

LGjr-RG, PacificCoastNews

It looks like Hilary Duff's relationship with her trainer Jason Walsh took a romantic turn!

The actress and her fitness guru, who have been seen enjoying each others' company for some time now, are "casually dating," a source tells E! News. The casually clad couple were most recently spotted stepping out together in Manhattan's Soho neighborhood earlier today.

Duff was strutting a striped long-sleeve tee with denim shorts and a black hat, while her beau rocked a black cap and shades with his plain gray T-shirt and jeans.

The pair have been spending a lot of time with each other in recent months, both in the gym and out at various restaurants to enjoy some fine dining, and it seems this budding romance began as a friendship between the two. "They weren't all over each other. He's her trainer and they hang out," a source previously told E! News. "They hang out and they are friends."

Ah, a love story that begins with friendship...

Duff and Walsh were also recently spotted on a dinner date at pizzeria il Fico in Los Angeles. The duo enjoyed some slices while watching Kobe Bryant's last basketball game in the NBA.

"It was just the two of them, but it was a busy night, so the restaurant was packed and they were watching the game like everyone else," an insider tells E! News. "They looked like they were having fun, because the game was crazy, but I didn't notice them acting affectionate or anything. They were just watching and cheering with everybody in the restaurant."

Along with new love, Duff has something else to celebrate, too!

Sounds like a great start to her summer.

—Reporting by Alli Rosenbloom