Simon Cowell‘s son is growing up so fast!

On Tuesday, Aug. 11, the 55-year-old TV star took to his Twitter account to share a beautiful new family photo of himself with his girlfriend, Lauren Silverman, and their 17-month-old toddler — and we can’t believe how big Eric has gotten!

In the sweet snapshot of the trio on vacation, a shirtless Simon can be seen donning a pair of white swim trunks and sunglasses as Lauren, 38, snuggles up to her love in what looks like a bikini and matching red coverup. Eric poses next to his parents in a cute blue bucket hat, a T-shirt and board shorts.

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The former American Idol judge and his girlfriend welcomed Eric in February 2014. Lauren previously split from her husband, Andrew Silverman — with whom she has an older son — in July 2013 after revealing she was pregnant with Simon’s child. She and Andrew finalized their divorce in August 2013.