The former First Lady turned 51 on Monday and took to Twitter to thank her 1.7 million followers. She tweeted: “Thank you to everyone for the wonderful birthday wishes!”
Reports suggest Donald Trump and Republican officials used the occasion to ask supporters to donate to the ex-President’s party.
Well wishers were advised to donate $100 (£72) to “defend the Trump legacy”, The Times said.
The newspaper said that, over the weekend, emails and texts were sent to Republican supporters asking them to sign a digital birthday card.
An email sent on Sunday read: “We know how much the First Lady means to YOU so we’re going to give you ONE MORE chance to sign her card, but you must ACT FAST!”
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Mr Trump, who has been banned from several social media sites after the Capitol riots on January 6, has not publicly commented on his wife’s birthday.
The Trumps relocated to their private Mar-a-Lago resort in Palm Beach, Florida, in late January as Joe Biden took office.
Mrs Trump has not made an official public appearance since the couple left the White House.
However, her husband has remained active on US media and continues to support the Republican party despite previous rumours he might make his own political group.