During the course of their 15-minute long conversation, the 19-year-old told PEOPLE they spoke about Lexi's life, college and, of course, Adele's 45-kilogram weight loss.
"Adele came over and sat down next to me and my friend and was like, ‘So what can I do for you girls?'. We were so excited. We were talking to her for a little while, and then she got Harry Styles to come over and sit with us also.
“She said she lost something like 100 pounds, and that it’s such a crazy positive experience,” Lexi Larson told PEOPLE of her intimate chat with the hilarious songstress. “She seemed so happy, and she looked amazing. She seemed really confident."
While the songwriter is adamant she's on track, her nearest and dearest are said to be concerned for the health and wellbeing, with some of her pals even begging the "Someone Like You" artist to "slow down and stop dieting".
“Nobody disputes she’s done brilliantly to lose this weight, but now it’s getting obsessive,” an insider told Radar Online. "If she left it as she is now that would be fine, but she’s talking about losing a bunch more and really pushing herself to get the body of an athlete.
"She’s eating bird-sized portions and working out non-stop in the gym – often up to three times a day! Fitness has turned into a real OCD obsession, but she can’t seem to do moderation at all."
Her change in figure comes months after she confirmed she'd split from her husband of seven years, Simon Konecki, 45.
“Adele and her partner have separated,” the singer’s representative Benny Tarantini and Carl Fysh said in a statement to the Associated Press. At the time of their split, a representative for the Skyfall singer said: “Adele and her partner have separated. They are committed to raising their son together lovingly. As always they ask for privacy. There will be no further comment.”