By Seamus Duff Alex Jones was emotional as she took a moment out of her day to reflect on the fact her young son is growing up fast. The 46-year-old host of the BBC’s The One Show is a proud mum-of-three – sharing sons Teddy, seven, and Kit, four, and daughter Annie, two, with husband Charlie Thomson. Teddy celebrated his birthday with a party, and Alex also a snap of balloons in their family home – with a giant silver seven hanging in the air alongside a large football-shaped balloon. Taking to Instagram Stories on Monday, Alex hinted that she is struggling to accept the fact her eldest child…