Kajol, 41, especially took a break from "Dilwale" shoot to celebrate her son's birthday yesterday before resuming the Hyderabad schedule of the Shah Rukh Khan-starrer movie.
"Very happy and proud as Yug turns 5 today! Let's make sure every child has that chance. Help every child reach 5 & keep that soap close by," Kajol, who is the celebrity ambassador for "Help A Child Reach 5" campaign, posted on Twitter.
The "Drishyam" star tweeted a picture of the cake-cutting ceremony.
The "Raju Chacha" stars, who tied the knot in 1999, are also parents to Nysa, 12.