Chris Moyles claimed to be a second-hand car dealer in a bid to save up to £1 million in tax, a tribunal said.
Amanda Holden and Jennifer Saunders were in the audience as the DJ made his major stage debut in a new production of Jesus Christ Superstar.
Chris Moyles has been given a send-off by showbiz pals including Ant and Dec who hosted a This Is Your Life-style farewell.
Outgoing Radio 1 breakfast host Chris Moyles has recorded a track with chart stars Rizzle Kicks.
The DJ told listeners he had joined the band in the studio to create the knockabout track in which they exchange banter, poking fun at each other's ages.
The Mama Do The Hump hitmakers were also guests on his show today as Moyles hosted his penultimate breakfast slot in front of 200-plus listeners at the BBC's Radio Theatre.
Moyles, 38, was welcoming a series of special guests on the show and his team presented a series of video montages looking back at his period of more than eight years in charge of the prestige morning show.
Moyles will bow out from the show for a final time tomorrow. Fellow Radio 1 DJ Nick Grimshaw is to take over the programme later this month.
Nick Grimshaw is set to inherit an audience of under seven million when he takes over the Radio 1 breakfast show in September.
The Chris Moyles show pulled in 6.9 million listeners in the second quarter of this year - down from 7.1 million in the first three months of 2012, according to figures released by audience measurement body Rajar.
Radio 2's Chris Evans easily beat Moyles in the popularity stakes with his breakfast show reaching an audience of 8.9 million, down from 9.2 million in the first three months.
Chris Moyles played a "cruel" prank on new breakfast host Nick Grimshaw today after he abandoned him in the studio live on air.
Grimshaw had been a guest on the flagship show and was talking about his appointment but Moyles and his team walked out, leaving the new host by himself.
The T4 presenter said: "Everyone's gone - this is not a hilarious on-air radio gag". He said Moyles had taken him for a drink last night and invited him on telling him they would have a "really nice morning together".
Grimshaw then told listeners: "I've only been up for 20 minutes. This is cruel, really cruel."
@grimmers AAAAAAARRRRRRRGGGGGHHHHHHHHH I knew it! CONGRATULATIONS!!!! You are going to be the best breakfast show EVER!!!!!! Well done! X
So happy for Nick Grimshaw :)
Today television and radio presenter Nick Grimdshaw was named as the successor to Chris Moyles as the presented of BBC Radio 1's breakfast show.
27-year-old Grimshaw has been with the station for five years and said he was "super excited" to be given the new role.
The presenter - known to listeners as 'Grimmy' - said: "It's been a dream of mine since the age of 11 and, to be honest, it hasn't really sunk in yet.
"I love Chris and have always looked up to him as one of the best broadcasters ever."
Nick Grimshaw is to take over the Radio 1 breakfast show, replacing Chris Moyles, the BBC said today.
Nick, who currently co-presents a late-night Sunday show with Annie Mac, is due to take over from Chris Moyles in September.