Both Kate and William were guests and Natasha and Rupert had been at their Royal Wedding in 2011.

Source: https://www.dailymail.co.uk/femail/article-12417119/Kate-Middleton-seen-chatting-guests-enjoying-drink-24-hour-rave-Norfolk-estate-friend-Rose-Hanbury-Marchioness-Cholmondeley.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Following the breakup, rumours began to circulate that Beatrice's cousin Prince William did not approve of the relationship and demonstrated his dislike of her partner by refusing to invite him to the Royal Wedding in 2011.

Source: https://www.dailymail.co.uk/femail/article-11914859/Case-ex-Princess-Beatrice-spotted-private-club-former-boyfriend-10-years.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Head to the gallery to see over 70+ pictures from Crown Prince Hussein and Princess Rajwa of Jordan’s Royal Wedding…

Source: https://www.justjared.com/2023/06/02/jordans-crown-prince-hussein-marries-rajwa-al-saif-in-royal-wedding-prince-william-kate-middleton-make-surprise-appearance/