“Happy birthday son” is a great place to start, but coming up with the rest of your son’s birthday wishes isn’t always easy!

Princess Eugenie’s son has entered the terrific twos ... of a park while the Bee Gees hit “Jive Talkin'” plays. “Happy 2nd Birthday to our boy Augie,” she wrote in the caption.

She posted this photo with her son Vayu in May on Instagram and wrote ... "My baby turns two today!!! Happy 2nd birthday to our sweet, precious Vayu! Being your mom is the greatest gift I ...