Country-pop sensation Taylor Swift has wished her younger brother, Austin, a happy 22nd birthday by sharing a changed version of the lyrics to her hit single, '22'. 

Writing on her official Twitter page this evening (March 11), she told him that she made him a meme especially for the occasion: "Happy Birthday, @austinswift7! I made an annoying meme to celebrate this momentous occasion!"

Swift then uploaded a black and white image of her brother as a toddler to the social networking site (pictured below), which she captioned with: "I dunno about you, but Austin is 22."

Earlier this week, Billboard revealed their annual Money Makers list and country-pop icon Swift reigned supreme at No.1 after it was calculated that she has earned $39,699,576 (£23,874,370) over the past twelve months.