Even the Duke of Edinburgh seemed charmed by Sheikha Mozah bint Nasser Al-Missned, the wife of the emir of Qatar, complimenting her youthful appearance.
She is on the guest list for Friday's royal wedding. And we can expect something truly spectacular from her.
This week in Spain at a glittering gala given by the country's royal family, and also attended by Antonio Banderas and his wife Melanie Griffiths, the Sheikha gave a foretaste of the kind of outfit she has in mind.
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Hopefully, for Kate Middleton the 52-year-old knows the rules about not wearing ivory at western weddings.
Sheikha Mozah accompanied her husband Sheikh Hamad bin Khalifa Al-Thani on the state visit.
The second of his three wives, she has borne him seven children since they married after her 18th birthday.