Taylor Swift [1] and Calvin Harris were just on a casual dinner date [2] in Santa Monica when a young fan by the name of Rick Selby popped by to take a photo. "Awesome dinner with mom and dad," Rick captioned his snap on Instagram [3].

Rick, your "mom" Tay looks awfully trendy. The singer wore a backless American Apparel skater dress [4] that fans out into an A-line silhouette, one of Ms. Swift's go-to styles. How could we have underestimated the sexy appeal of such a classic mini, churned out by the retailer [5] season after season?

Especially when dressed up with Taylor's glittering headband and her signature red lip, we see no better reason to add the velvet dress to our own wardrobe, just in time for Valentine's Day. Read on to see Rick Selby's post in full, then scroll to shop Taylor's outfit!

Taylor's American Apparel Dress

American Apparel Velvet Violette Dress [6] ($58)