Samantha, 53, went on her private Twitter account to throw shade aimed at the Duchess of Sussex in an effort to push her to send b-day wishes to their dad, Thomas Markle, who celebrated his 74th birthday two weeks ago.
Meghan Markle showed off her gorgeous birthday suit-at a friend's wedding.
Harry and Mr van Straubenzee are said to have struck up a close friendship as the groom, 30, and the royal attended Ludgrove School in Berkshire together.
Meghan Markle and Prince Harry may not be rocking the fashion boat, but they are going against royal protocol by often holding hands and kissing in public.
The Duchess of Sussex was attending the wedding of Charlie van Straubenzee, a close friend of Prince Harry, and Daisy Jenks.
"Happy Birthday to HRH The Duchess of Sussex!".
Sisters Eugenie and Beatrice put on stylish front in Vogue's September issue
Beatrice: "One of the biggest fights we ever had was about a pair of Converse trainers". She said: " Eugenie is very controlled - she is so sorted".
Meghan wowed onlookers as she swept into the wedding in dark glasses and a striking black, green, pink, and white sleeveless shirt-style dress from Club Monaco, along with a small black hat from milliner Philip Treacy.
Princess Eugenie, the daughter of Prince Andrew and Sarah Ferguson, and her finance Jack Brooksbank, who are also due to marry at Windsor Castle this October, also attended the wedding festivities.
The royal couple, Meghan Markle and Prince Harry have been photographed in their first royal engagement since they tied the knot last Saturday.
Even more, in another tweet, she called Duchess Meghan, "Witchy Poo".
This fall, the Duke and Duchess of Sussex will make their first major royal tour to Australia, New Zealand, Fiji and Tonga on behalf of Queen Elizabeth, the Foreign Commonwealth office, at the request of the host countries. Her frock featured a buttoned down bodice, cinched in waist and a flowing skirt.
Meghan and Harry do not have an official commitment now until September. We're sure this year's was just as special, Meghan!