Adele "absolutely" has a "pregnancy glow".

The British songstress announced in June she is expecting her first child with boyfriend Simon Konecki.

Adele was recently snapped stepping out for the first time in London since confirming her pregnancy, with her growing baby bump on display. Onlookers say the singer looked comfortable and content ahead of her impending labour.

"Adele was relaxed and calm, and she and Simon looked really great together," an eyewitness told Life & Style magazine.

"She seemed very, very happy. She absolutely does have a pregnancy glow."

There has been speculation that Adele and Simon may have already tied the knot in secret.

The 24-year-old star was sporting a gold band on her wedding finger when she was photographed, further fueling reports.

"Adele and Simon managed to keep the baby news a secret for so long that there are rumours they've already gotten married, too," an insider said.

"She's an old-fashioned girl and can't wait to be part of a family unit. She just wants to focus on the baby and the man she loves."