Smiling widely – and without a date on her arm – Chelsy Davy quietly slipped through the doors of Westminster Abbey to take her seat.
It's the strongest sign yet that her on-off romance with Prince Harry has blossomed once again.
The vivacious blonde looked dazzling in a gorgeous turquoise dress by Alberta Ferretti, which she paired with a discreet headdress.
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Chelsy has apparently been helping Harry with his best man speech in the last few weeks as she has been present on many of their nights out.
She will change into a second outfit - a one-shoulder midnight blue crepe satin gown with a cut out detail on the back, for the evening reception.
Other members of the young royal set spotted taking their seats included Holly Branson.
The recently-engaged daughter of Richard Branson didn't arrive with her broker fiancé Fred Andrews, however.
Dave Clarke - Princess Beatrice's boyfriend - accompanied her. Prince Andrew's daughter was nowhere to be seen, as she would be making her way to the Abbey with her father and sister.
Ben Fogle, Prince William's adventurer friend greeted fellow congregation members enthusiastically inside.
On his arm was his pregnant wife Marina, looking lovely in an emerald green dress.