LONDON - Pop star Britney Spears, who is in London for her Circus tour, took a day off to take her sons to the zoo.

The singer enjoyed her visit with sons Sean Preston (3) and Jayden James (2) with ex-husband Kevin Federline, reported thesun.co.uk

Spears has hired Federline as a nanny for their sons and is paying him $5,000 per week for baby sitting.

Spears is currently performing at the Britain leg of her tour at London’s O2 Arena.