Anthony Joshua has 30th birthday celebrations disrupted by drug testers

Anthony Joshua saw his 30th birthday celebrations gatecrashed by drug testers on Monday.

His manager, Freddie Cunningham, shared footage on social media of the former heavyweight champion preparing to tuck into a huge chocolate cake.

The British star was celebrating his latest birthday during the middle of his training camp in Sheffield ahead of his December 7 rematch with Andy Ruiz Jr.

But after pals brought out a huge cake, a drug testers arrived for a surprise visit, forcing him to give a sample a blood sample.

Joshua’s clash with Ruiz Jr sees the pair signed up to voluntary VADA testing, being available throughout camp at any random times.

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It is unclear how much of the massive cake Joshua was able to enjoy as he prepares for the biggest fight of his career so far.

The Brit has slimmed down in recent weeks, showcasing a much more slender figure when he came face to face with Ruiz in Saudi Arabia to promote the fight recently.

After shedding muscle mass in order to improve his mobility, he is now putting in the hard yards to ensure he is ready to recapture his world title belts later this year.

But he is not the only fighter in top shape, with Ruiz Jr warning the Watford-born boxer this week that he will enter the ring in better condition than when he won the titles in June.

“I will arrive in better condition…. lighter, faster and more powerful,” Ruiz said to ESPN Deportes. “They will believe that in December they will win.

“People will always talk like this, but I have faith that we’re going to win and shut up more mouths.

“I have a lot of respect for Anthony, outside the ring he is a very good man. But inside [the ring] there are no friends, there is no respect or anything.

“It will not be an easy fight. I think it will be a hard fight, but nothing is easy in life, so we are training very hard. We will be prepared for whatever he brings.”