Lavigne, 28, has picked out his and hers bands for her upcoming nuptials to the 38-year-old Nickelback frontman, according to Life & Style magazine.
An eyewitness who observed the Sk8ter Boi singer's visit to Neil Lane's headquarters in Beverly Hills tells the publication, "Avril came into the store alone. She worked with the staff and seemed very excited about her wedding."
The pop star and designer reportedly chose a petite pave diamond eternity band set in platinum for herself and a matching wide, modern platinum band for her man.
The couple plans to wed in Lavigne's native Belleville, Ontario, on 15 June (13).