All About Justin Bieber: Selena Gomez's mum says she doesn't talk to her about on/off relationship with Justin Bieber

SELENA Gomez keeps shtum when it comes to talking about her on/off relationship with Justin Bieber - even with her mum.

The singers rekindled their rollercoaster romance after Selena's life-saving kidney transplant - but it's thought they've already split.

Selena Gomez is said to be single again after split with Justin Bieber

As her mum Mandy Teefey was quizzed on the young lovers' rocky relationship, she admitted she'd be the last one to know what's going on.

She told E!: "You would know before I did. We don't talk about it."

It comes after reports claiming that despite the apparent split, Justin, 24, still has his former flame on his mind.

An insider told People: "He isn't dating. He thinks and talks about Selena all the time. The chapter with her is definitely not finished."

Selena Gomez pictured this week looking downcast in Los Angeles

The pair first met when they were teenagers but recently rekindled their relationship

Although he has made an effort to develop a better relationship with 25-year-old Selena's friends and family - they're not convinced he's a suitable boyfriend.

The insider added: "Justin does care what her friends and family think and has tried to win them over, but some of them are just over it.

"They're there for Selena and support her no matter what, but don't feel like they need to welcome back Justin.

"If you notice, Selena keeps her friends and Justin separate - when she's with Justin, it's just Justin, and when she's with her old friends, it's just them. They don't really overlap anymore."