Gwen Stephani during her appearance on Jimmy Kimmel Live forgot to wear her wedding ring.

The star later issued an apology to her husband Blake Shelton, after realizing that she forgot to put on her wedding ring. 
 
“I forgot to wear my ring,” she told host Jimmy Kimmel while showing off the other rings on her hand. “It’s like the first time! I thought, ‘OK, I’m going to put it in the jewelry cleaner so Jimmy sees how sparkly and amazing my ring is.’ And then hello empty finger.”
 
“I’m so embarrassed!” she added. “I’m sorry, Blakey. I love my husband, and I love being married to him. It’s just the greatest thing that’s ever happened to me, so here we are.” 
 
The duo first bonded when they appeared as coaches on the hit show, The Voice. At the time, Blake was splitting from his ex-wife Miranda Lambert and Gwen was going through a divorce with Gavin. according to E News.