United Kingdom, Feb. 23 -- Jennifer Lopez has paid tribute to her children on their 17th birthday.

The 55-year-old pop superstar has twins Max and Emme with her ex-husband Marc Anthony and took to social media late on Saturday (22.02.25) night to honour them on their special day.

She wrote on Instagram: "Seventeen. I love you beyond forever."

The 'Jenny from the Block' hitmaker previously described motherhood as the "hardest job" in the world.

She told British Vogue when asked to describe being a parent in three words: "It's a blesssing, challenging, beautiful. It's like a beautiful, challenging blessing. [But] I think being a parent is the hardest job anybody could have in this life."

The 'Love Don't Cost A Thing' songstress took on...