As the rest of the world woke up to the news of Serena Williams' record-breaking 23rd Grand Slam victory, the praises poured in from Karlie Kloss, Kobe Bryant, Laverne Cox and more!
WTA Staff

MELBOURNE, Australia - It was during the wee hours of the morning for most of the world when Serena Williams defeated Venus Williams in the final of the Australian Open, clinching an Open Era record 23 Grand Slam titles.

But the impact of Serena's victory was felt all over the world, and the congratulations poured in from big names everywhere - from her tennis peers on the WTA and beyond, to fellow sports stars and celebrities.

One of the first to send her congrats was Karlie Kloss - she gave them to the champion in person. The model was in Melbourne and at Rod Laver Arena with a front row view to Serena's monumental achievement.

Also in the front row? Reddit co-founder Alexis Ohanian, though you might know him better as Serena's fiancé:

Serena's fellow Nike athletes - led by basketball legend Kobe Bryant - sent had a simple yet powerful message for her: "Greatest ever."

The WWE even put Serena's accomplishment in a category of its own, creating a specially-designed title belt for the 23-time Grand Slam champion. She can add this to the custom surprise she received from one of sports' biggest legends, Michael Jordan.

But as the rest of the world woke up to the news of Serena's history-making achievement, congratulations began to pour in from all over the Twitter-sphere.

Check out some of the best celebrity tweets: