Emma Bunton is devastated after her dog went missing.

The Spice Girls singer - who has sons Beau, five, and Tate, 19 months with long-term boyfriend Jade Jones - took to her Twitter page to beg fans to be on the lookout for her brown Labrador Phoebe after the dog wandered off near Emma's London home.

She wrote: ''My gorgeous brown Labrador went missing on daily walk, she will be so scared please look out around east barnet, Hadley wood, Trent park

''Her name is phoebe!! She is so gentle, please look out for her.

''I'm in bits, thank you for all your reassuring messages! Please keep looking

''Yes she's chipped (sic).''

2013 is set to be a busy year for Emma as it was previously claimed she and the other Spice Girls, Mel C, Geri Halliwell and Mel B are planning to replace Victoria Beckham, who wants to concentrate on her fashion label, and reunite for a new tour.

A source said: ''The girls are going it alone without Victoria. They are keen to get back together and were trying to work out if they could do it as a four-piece. I think they know this is the last chance for them to get the band going again.

''But the Spice Girls as a foursome is not going to get them another record deal or sell out big venues. They need an extra cherry on the cake. And the cherry on the cake would be if they replaced Victoria.

''And that leads to the next question: who do they replace her with? At the moment it's all being done in a very cloak-and-dagger way and not through official channels.

''At the moment they're thinking who, out there, who's been in a another band, could be Victoria. There would be interest in a television series, but I think they're keen on someone with industry experience rather than discovering a new star.''