Britney Spears has reportedly sent pop rival Christina Aguilera a self-help guide to marriage.The sexy star bought the blonde singer - who recently tied the knot with lover Jordan Bratman - a tome entitled 'How to Stay Happily Married', according to Britain's Daily Star newspaper. The singers have only recently called time on a bitter feud, which was sparked after Christina reportedly got up close and personal with Britney's ex Justin Timberlake at the Brit Awards. Christina, who first met Britney when the pair starred on the 'Mickey Mouse Club' as children, even sent the 'Toxic' singer a gift basket to prove her change of heart. She revealed: "I sent Britney a gift basket, and she phoned me to say thanks"Christina admitted the pair have a lot of catching up to do, and said she still can't believe Britney has a baby, Sean Preston, and is married to Kevin Federline.
She said: "I still can't believe Brit has had a baby! It's weird, you've known this person since she was a girl and now she's doing all these grown up things. It's been quite a journey for both of us
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