The 43-year-old cricket star took to social media to post glimpses from the celebration, captioning it: "My favourite day of the year with my favourite. Happy birthday Izhaan. May you have many more years filled with joy and happiness."
The heartfelt message quickly received thousands of likes and warm wishes from fans, who flooded the comments with love for both the cricketer and his son.
Earlier, Malik shared another touching post when Izhaan performed Umrah for the first time last month.
The proud father wrote on Instagram: "May Allah accept your Umrah, Izzu, and always protect you. Baba is super proud of you and sending lots of love. See you soon," accompanied by a heart emoji to show his affection.
The post resonated deeply with fans, who praised Malik for being a devoted father and filled the comments with prayers for Izhaan.
Shoaib Malik shares his son with Indian tennis icon Sania Mirza.
The two tied the knot in 2010 in a high-profile cross-border wedding that symbolized unity between the two nations.
Their son Izhaan was born in October 2018 in Hyderabad, India.
However, after years of speculation surrounding their relationship, Shoaib and Sania eventually parted ways.
Before his marriage to Sania, Malik had also been in the spotlight over his controversial first marriage with Ayesha Siddiqui.