David Beckham had the ultimate "proud dad" moment when he taught his daughter, Harper, how to ride a bike. On Sunday, the former soccer star shared a photo on Instagram of himself running alongside the 3-year-old as she pedaled without training wheels, writing, "Look at my big girl. Day one: no stabilizers." David has been filling his feed with tons of cute snaps since joining the app just last month. He gained one million followers in just one day and was up to five million a few days later — an Instagram record. David's Instagram arrival came just before his 40th birthday, which he celebrated with famous friends (including Eva Longoria, Gordon Ramsay, and the Spice Girls) in Marrakech, Morocco. After a big night of partying hard, David got some help with his hangover from little Harper, who set out to make her dad "feel pretty" in an adorable photo David shared.