On Thursday the 54-year-old posted a photo of himself and baby Eric with the caption "Bath time!"
Simon was spending a family night in watching England's World Cup game against Uruguay and he also posted a photo of his dogs Squiddly and Diddly lying on his bed.
Bath Time ! pic.twitter.com/CAqViH2S1P— Simon Cowell (@SimonCowell) June 19, 2014
"My dogs have turned into vampires," he wrote, referring to the light reflecting in their eyes, before adding of England's match: "This game is total torture tonight".
Simon Cowell reveals how son Eric has grown in touching personal shots
Music mogul Simon was enthused to see England's Wayne Rooney score an equalising goal, tweeting "Back in the game", although Uruguay went on to win the game 2 - 1.
My dogs have turned into vampires pic.twitter.com/4KHEN4UuhK— Simon Cowell (@SimonCowell) June 19, 2014
Simon has been busy working on the next series of X Factor.
Earlier in the week he revealed that judges Cheryl Cole and Mel B are "really really good" after the panel came together for the first round of auditions.
Cheryl has returned to the ITV reality show after a four-year break while former Spice Girl Mel B has joined the programme as a full-time judge for the first time ever.
Simon himself is also back on the show for the first time in years, after attempting to take the show to the United States, with Britney Spears and Demi Lovato as his fellow judges.