The singer, 36, was spotted with her son Sir near her Miami mega-mansion on the weekend. Picture: YouTube.com

London - Wearing the contented smile of a new mother, Beyonce takes a stroll with one of her five-month-old twins – in the first glimpse since they were a month old.

Beyonce and her rapper husband Jay-Z, 47, have been keen to keep the twins out of the limelight. Until now, the only photo of them was one posted on Beyonce’s Instagram in August.

The singer, 36, was spotted with her son Sir near her Miami mega-mansion on the weekend. Her mother Tina Knowles, 63, was looking after her granddaughter Rumi. Beyonce’s other daughter, five-year-old Blue Ivy, is said to be adjusting well to life as a big sister, even helping her mother look after them.

The couple just recently splashed out  $26 million on a mansion in The Hamptons, just weeks after purchasing a home in Los Angeles for $88m.

Her grandmother, Miss Knowles, said: "She’s doing amazing. She’s a big sister and she feeds them and she’s excited."