Ashton Kutcher has rebounded (again) after the breakup of his marriage to Demi Moore -- this time, with his former That 70's Show co-star Mila Kunis!

X17 photographers have spotted the actors together on multiple occasions, recently. Ashton and Mila have even spent the night at each others' houses!

Today we saw the two furniture shopping and grabbing a sushi dinner together tonight at Asanebo in Studio city before they returned to Ashton's new mega-mansion in the Hollywood Hills.

Our photographer tells us the couple looked more than cozy together inside the restaurant: "Ashton was touching Mila's hand and Mila was all dressed up. She looked hot; this was definitely more than a dinner between friends -- this was a full-on date!"

Mila was wearing skin-tight skinny jeans and super-high heels, while Ashton was in his uniform -- a baseball cap and sweater. Ashton chauffeured, with Mila in the back seat. 

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