This might be the sweetest game of Where's Waldo? you have ever seen.

After spending the last three years in Australia, 31-year-old Ali wanted to fly home to London to surprise his mother for her birthday. But he didn't want to just show up at his parent's front door - he wanted to do something more memorable.

With the help of his dad and his brother Steve, Ali dressed up as Waldo from Where's Waldo? and hid in the airport terminal while Steve picked up their parents.

In the video, Ali can be seen running all around the airport in his red and white striped outfit while his parents search for their surprise.

Finally, his Mom spots a red and white hat in a cafe and is positive she's found Waldo - but what she doesn't expect is to see her son Ali under the hat!

Ali jumps up and gives his mom a huge hug as she asks, in complete shock: "What are you doing here?!"

Click the link below to watch the full video of Ali's heartwarming surprise…