Justin Bieber and Selena Gomez enjoyed a double date with his grandparents on Sunday (22.06.14).

The on/off couple, who recently reunited, were joined by the 'Confident' singer's maternal grandparents Bruce and Diane Dale during a trip to Los Angeles Zoo.

According to HollywoodLIfe.com, Justin, 20, ''stayed close by Selena's side'' as they took in the sights, including a peacock which the singer appeared to take issue with.

Posting a snap of the colourful feathered bird on his Instagram account, Justin quipped: ''Hey u quit lookin at me like that (sic)''

It seems the A-list stars, who were on their third date in the space of a week, had their own police escort to help them navigate around the spacious zoo without being mobbed by fans.

David Osokow, director of client relations at SBE entertainment group, posted a picture of Justin, Selena, 21, and a Lieutenant Beccera on his Instagram account, thanking the police official for his ''looking after us''.

The couple's Sunday zoo date comes just two days after Justin and Selena enjoyed a romantic meal for two at Mastro's steakhouse in Beverly Hills, California, on Friday (20.06.14). The stars later checked out new movie 'Think Like a Man Too' at a local cinema.

Meanwhile, Justin and his on/off girlfriend appeared ''smitten'' at a bible study class at City Church in Los Angeles last Wednesday (18.06.14).