The Pretty Woman star admits she had never heard of the British star until a hairdresser friend urged the actress to check out her new album and upon hearing it, Roberts admits she became an immediate fan.
The Oscar winner says, "I thought, 'How have I lived my whole life without knowing what she sounds like singing?' It's that kind of voice.
"Someone Like You is probably everyone's favourite (song), but I just love it. And I love the video - she looks so gorgeous, rocking her eyeliner. Adele's music is so personal that you get invested in her life."
The actress admits she is also concerned about Adele's vocal problems, which prompted the singer to scrap a U.S. tour this year (11) and undergo surgery on her throat last month (Nov11).
She adds, "When Adele had her health scare, I had random people saying to me, 'Oh my God, did you hear about Adele...?' It really made me think, 'We all have a real investment here'.
"We feel like Adele's in our book club or she lives in our neighbourhood - and that's a gift, to make people feel that way."
The new issue of the publication also features a tribute to actress Viola Davis, written by her Doubt co-star Meryl Streep, a piece on Brad Pitt by his The Fight Club director David Fincher and articles glowing about Ryan Gosling and Emma Stone by Steve Carell and Woody Harrelson, respectively.