Steve Irwin's Son Robert Turns 16 and His Mom Terri Shares Throwback Photo and a Touching Note

Proud mother Terri Irwin shared a never-seen-before throwback photo of Steve Irwin and Robert as the teenager turned 16 on December 1.

Over the weekend, the late Steve Irwin's only son, Robert, turned sixteen, and to celebrate, his mom Terri took to Twitter to share an unseen photo of her son according to Daily Mail.

The tweet, in which Terri gushed about how the late conservationist would be so proud of his son, showed her late husband holding Robert as a baby.

Although Robert was only two years when his father died, those years impacted his life as he grew up to be a TV personality and wildlife photographer.

Although Robert was only two years when his father died, those years impacted his life as he grew up to be a TV personality and wildlife photographer. Even his sister, Bindi, also went on to become a conservationist.

While it's been over a decade since Steve died, his children still remember him in everything that they do.

According to a PEOPLE report Bindi took to Instagram to share a family portrait with the caption:

"Dad, You would be so incredibly proud of Robert. He has been such an amazing support during this beautiful new life chapter. I know you'd be beaming with pride when the time comes that he walks me down the aisle. I wish you could be here for these moments, but I know that your spirit lives on in us."

Bindi, who recently got engaged to Chandler Powell,

to PEOPLE that her wedding would include "little bits" of her late father.

In fact, the 21-year-old intends to have a candle lighting ceremony, which will allow family and friends to share their favorite memories of the TV personality.

Meanwhile, Daily Mail reported that Robert celebrated his birthday at the Australia Zoo. During the event, which had his mother in attendance, the 16-year-old had the pleasure of cutting a large rhinoceros cake with candles marking '16' on it.

Guests at the party went wild with excitement when the cake was wheeled into the Crocoseum.

The guests also sang the celebrant a birthday song and clapped when Australia Zoo gifted the birthday boy a huge rhinoceros statue.

Up until his death in 2006, Steve Irwin was a zookeeper, television personality, wildlife expert, and conservationist. He also appeared in some TV shows and movies like "The Crocodile Hunter," "Happy Feet," "Bindi the Jungle Girl," and "Dr. Dolittle 2."