The little prince wore a green sweater with a plaid shirt and jeans, marking the first time that Prince Louis wore long pants ...

Prince William and Catherine, Princess of Wales, honored their youngest son, Prince Louis, by sharing a new photo of him ...

Prince William and Kate Middleton’s youngest child gave a glimpse of his gap-toothed grin in the sweet snap, shot by Josh ...

Louis, who showed off his missing front teeth in his birthday photo, displayed his adventurous side in the new footage ...

The Prince and Princess of Wales took to social media to share a sweet snap of their youngest son on his special day.

Prince Louis celebrated his birthday on Wednesday after a roller-coaster year dominated by his mother's cancer treatment.

Over the weekend, the “Kardashians” star posted photos from her daughter’s big day, which featured a “Rainbow Friends” theme.