In a photo posted by the 43-year-actor on Instagram, the adorable pair modeled their matching red-and-white heart tops and red heart sunglasses.
While Harper completed her look with a fabulous fur coat and patterned, pale pink leggings, Gideon was channeling some serious boy band vibes with baggy red jeans, black sneakers, a trendy red-and-black jacket and his blonde locks tucked under a casually-placed baseball cap.
“Happy Valentine's Day from these two bundles of love! #cupids,” the How I Met Your Mother star captioned the photo.
Seems there’s no shortage of fun when Harris is your dad.
In addition to the fun Valentine’s Day dress-up, the actor and his husband, David Burtka, recently took the twins on a family vacation to Telluride, Colorado, where they enjoyed some luging adventures.