The eldest child of Victoria and David Beckham issued the friendly challenge to his mum's best friend yesterday after noticing they were neck in neck when it came to followers.
Desperate Housewives star Eva was narrowly in the lead with 922,000 followers, while Brooklyn was hot on her heels with 920,000.
After issuing the challenge, however, fans of Brand Beckham leapt to action, propelling Brooklyn into the lead with 929,000 by the time of writing.
Come on Eva fans, get following!
Brooklyn shared a Throwback Thursday picture of himself and Eva last week, showing the actress beaming as she rested against his shoulder.
Victoria and Eva have been friends for years, with Eva frequently wearing Victoria's fashion designs and accessories. In fact, just yesterday Eva tweeted about how VB sunglasses were one of her travel musts!
Last year, Eva revealed that she and Victoria were girls after our hearts, saying they loved nights in with pyjamas and lots of food, joking: " It actually gets messy because all we do is go to Victoria's house and eat! That's really our version of fun! We're like, 'Oooo - we're taking our shoes off, in our pyjamas!'"
Eva is godmother to Harper Beckham.
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