Selma Blair Celebrates Son Arthur's 14th Birthday as She Says He Makes Her 'Whole Life' Seem to 'Sing'

Selma Blair Celebrates Son Arthur's 14th Birthday as She Says He Makes Her 'Whole Life' Seem to 'Sing'

The star shares her only son with ex Jason BleickSelma Blair/Instagram; Mike Coppola/Getty Selma Blair's son ArthurSelma Blair's son is another year older!On Friday, July 25, the actress, 53, celebrated her son Arthur's 14th birthday with a series of throwback photos on Instagram. The newly minted 14-year-old could be seen posing on a motorcycle, spending time at the beach, walking beside a horse and posing with his mom.She also included a sweet…