Queen Elizabeth II
Queen Elizabeth II is seen at the Chichester Theatre while visiting West Sussex on Nov. 30, 2017, in Chichester, United Kingdom. Getty Images/Stuart C. Wilson

Queen Elizabeth II will be attending Lady Gabriella’s big day and many are looking forward to what she will be wearing.

Lady Gabriella Windsor will walk the aisle and exchange “I dos” with Thomas Kingston on Saturday. The couple will tie the knot at St. George’s Chapel in Windsor, a day before Prince Harry and Meghan Markle’s wedding anniversary. The Duke and Duchess of Sussex also wed in the same venue.

Ladbrokes predicted that the Queen will wear either blue or yellow. Sixty percent of the bets are placed on these two colors.

”Royal punters are backing blue once again and after correctly predicting the sex of Will and Kate’s baby, attention now turns to the colour of Her Majesty’s hat on the big day,” Alex Apati of Ladbrokes said.

Meanwhile, the odds that Her Majesty will wear a green hat are at 4/6, pink at 6/1, cream or ivory at 8/1, purple at 10/1, turquoise at 10/1, red at 12/1 and orange at 16/1. The least likely colors are silver at 201/1, gold at 33/1 and brown at 40/1.

Queen Elizabeth II wore yellow at Prince William and Kate Middleton’s royal wedding in 2011. Last year, she donned a bright green coat with a matching hat with a purple feather at the Duke and Duchess of Sussex’s big day. Meanwhile, the Queen opted for a pastel blue outfit for Princess Eugenie’s special day.

Initially, many thought that the Queen would snub Lady Gabriella’s wedding. According to royal commentator Robert Jobson, the Queen would not return to St. George’s Chapel and was unlikely to attend the event because “it may be a bit distant.”

The Duke and Duchess of Cambridge and the Duke and Duchess of Sussex may also not make it to the wedding. The fab four didn’t attend the wedding of Lady Gabriella’s brother, so they may skip her’s, too.

However, according to Jessica Bridge from Ladbrokes, Middleton and Prince William, along with Pippa and James are expected to be part of the celebration. However, Prince Harry and Markle might not make it to the event.