Dua Lipa and Callum Turner have made their relationship Instagram official. The ‘Houdini’ singer has been romantically linked with the 34-year-old actor since January and though neither of them have commented on the speculation, the 28-year-old star has confirmed the rumours as part of a post celebrating her weekend at Glastonbury, where she made her first headline appearance. In amongst a number of photos and video recaps from her time at the festival, Dua shared a photo of herself and Callum staring into each other’s eyes while they lay on the grass. She captioned the post: “dancing until yo…