PRINCESS Kate has been mingling and joking in Wimbledon's Royal Box with tennis legend Roger Federer as she cheered on Andy Murray.

The Princess of Wales looked chic in a green and white ensemble as she took to the stands – though did have to flee the rain when supporting young British star Katie Boulter.

She had made a rare royal appearance at one of the smaller courts for Boulter's encounter – but headed to Centre Court for Murray's match and a reunion with Federer.

She and the retired Swiss star were seen chatting and laughing.

They evidently enjoyed being back in each other's company after previously teaming up for a pre-Wimbledon event.

Eight-time Wimbledon champion Federer, who retired last year, had joined Kate in a video before this year's tournament started.

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The pair were filmed playing a rally together – with a cheeky ball girl telling Kate that she had broken Wimbledon protocol.

Federer's appearance in the Royal Box today marked his first return to Centre Court since retiring last September.

The 41-year-old, fresh from appearing on stage with Coldplay in Zurich over the weekend, received a rapturous standing ovation and looked visibly moved before taking his seat next to the princess.

Despite today's grey weather, Kate remained cheerful as she first popped up an official Wimbledon umbrella to leave Court 18 when play was suspended for the match between Boulter and Aussie Daria Saville.

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Boulter, serving to stay in the first set at 5-6, was forced to ditch her racket and flee the rain.

Wearing a green blazer and white skirt and heels for Boulter's first set, the princess sat in the stands with former Juniors winner Laura Robson.

Kate also sported a £75 gold high street bracelet from French brand Sézane.

A moustachioed Danny Dyer was among the other famous faces watching day two of the tournament.

Centre Court was expected to host a battle of the Brits between Murray and with world number 268 Ryan Peniston at about 4pm.

Peniston, 27, from Southend, said he “almost crashed” his car when he found out he would be facing the two-time champ Murray, 36, in the first round.

If Murray gets through today he will most likely have to face No 5 seed Stefanos Tsitsipas in the second round.

British players Heather Watson, Dan Evans, Sonay Kartal, and Arthur Fery were also being called into action today.

Rain was expected to batter SW19 today with thundery showers forecast before hopefully clearing later this afternoon.

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On day 1 Venus Williams and Coco Gauff crashed out in stunning fashion, while champion Novak Djokovic overcame Argentine World No 57 Pedro Cachin to secure his place in round two.

No 9 seed American Taylor Fritz was continuing his first-round match against Yannick Hanfmann which was suspended last night, while his US counterpart Frances Tiafoe was due to begin his campaign later today.

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