Ellen’s adorable little British duo made their triumphant return to the show this week performing Taylor Swift’s new hit single, “I Knew You Were Trouble” to a standing ovation from Ellen’s studio audience.

Sophie Grace handles all the lead vocals for the duo and her hype girl Rosie has stepped up her game, adding in some sassy choreography.

The two also made an appearance at Barnes and Noble this week to promote their new book, Tea Time with Sophia Grace and Rosie.

I’m not sure why you’d buy that book or want to meet them unless you’re a little kid, but if you are one of those people, I imagine meeting them was like one of Taylor’s super fans touching her hand at one of her shows.

Time for a viral video marathon! Watch some of Surfer Stephen’s previous picks below:

• Katharine McPhee Meets Russell Brand
• Sophia Grace & Rosie Perform ‘Girl On Fire’ On Ellen
• Ellen Watches Her SNL Spoof