Either Diane Kruger is possibly engaged to longtime boyfriend Joshua Jackson or she's just a lucky girl sporting a gorgeous new diamond ring. Either way, it's not just the new sparkler that caught our attention — the fashion pro also wowed with a cool-girl look while out to dinner with her beau. Keeping proportions slouchy and casual but no less sexy, the actress outfitted easy leather trousers with a textural striped sweater. The trick to making these pieces date-night appropriate? Do as Diane did and just add hot red heels.

Shop clockwise from top left: Zara Leather Effect Trousers ($80), H&M Mohair Blend Sweater ($60), Alice + Olivia Dina Suede Pumps ($282, originally $402), Kate Spade Sedgewick Place Avalon Bag ($298)

Get a peek at the new jewelry!