A noticeably slimmer Kyle Sandilands leaves John Ibrahim’s office with girlfriend Tegan Kynaston

He’s the KIIS FM radio star who is set to celebrate his milestone 50th birthday this week with a wild yacht party on Sydney Harbour. 

And ahead of the bash and his big day, Kyle Sandilands, 49, was seen enjoying a low-key day out with girlfriend Tegan Kynaston. 

Kyle was seen leaving good friend and Sydney nightclub identity John Ibrahim’s office in Kings Cross on Monday, while Tegan grabbed a fresh juice nearby.   

Kyle looked noticeably slimmer as he stepped out his signature all-black outfit, wearing a Polo Ralph Lauren jacket, baggy trousers and black runners. 

Kyle sported a shaggy grey beard and a black cap and soon hopped into his Bentley. 

Tegan, 35, meanwhile turned heads in a pair of blue jeans with a leopard print jacket. 

The blonde bombshell teamed the look with high-heeled black boots and a beige Stella McCartney bag.

She was also joined by an unidentified male friend on the day, who grabbed a coffee. 

Shock jock Kyle will turn 50 on Thursday. 

Last week, Kyle revealed his wild party plans to mark the occasion.

Kyle told Stellar magazine he’s throwing a lavish yacht party over the weekend with guests including Today anchor Karl Stefanovic. 

Other guests include his close friends and family, various KIIS FM staffers and his girlfriend Tegan.

‘[Karl] Stefanovic has weaseled his way in,’ Kyle jokingly said. 

Kyle will also no doubt be celebrating the fact he and co-host Jackie ‘O’ Henderson have made history as their KIIS FM breakfast show received its biggest audience share ever last week.  

The Kyle and Jackie O Show took out its nineteenth consecutive No. 1 FM spot on Tuesday with a 12.9 per cent share of the Sydney audience.

This is the highest share the duo have ever achieved in their breakfast radio career.

The Kyle and Jackie O Show also has more listeners than any other breakfast radio program in Australia.