Pippa Middleton, 34, was seen joining the royals at the church service in Sandringham with her husband James Matthews, 42.
She wore a dark blue belted overcoat, matching it to her blue hat with a jaunty star on the right hand side.
Braving the cold with bare legs, she wore deep purple heels in contrast to the rest of the look with matching gold earrings.
Her husband matched in a blue overcoat and suit trousers.
The 34-year-old was joined by her sister, Kate Middleton, 35 and Prince William, also 45 who also attended the service.
Prince Philip, 96, was also part of the group who headed to St Mary Magdalen church for the Sunday service.
The pregnant royal was seen wearing a £445 Moloh tweed coat which she has previously worn to church services in the past, most notably in 2014 before becoming pregnant with Princess Charlotte.
She is currently pregnant with her third child, who is due in April.
Pippa married her husband last year in May at St Mark’s Church in Englefield, having previously dated in 2012.
They split up after a few months, before reconciling again in 2015 after Pippa’s three-year relationship with Nico Jackson ended.
Despite their short engagement, they have known each for over ten years.
She was recently spotted showing off a new bob, reminiscent of her sister Kate’s new look.
Pippa has often been compared to brother-in-law Prince Harry’s fiancess, Meghan Markle.
The 36-year-old actress recently announced her engagement to the royal last year, with the royal wedding due to take place in May 2018.
Her classic style has often been seen as looking very similar to Pippa’s, with long classic coast and floral summer dresses.
Their long brown hair and striking features also show a similar resemblance.