The Monty Python stars are to perform together on stage next year for the first time since the Hollywood Bowl in 1980. Tickets for the event were gone in less then an hour.
After the Pythons sold out their first show in 43.5 seconds this morning, tickets for four further shows had gone on sale.
Python star Eric Idle said: "It's totally amazing. I don't think we realised quite how much Python is loved round the world. We look forward to paying off Terry Jones' mortgage soon."
Fans snapped up the tickets - thought to be for around 72,000 seats - in the space of just 55 minutes after phone lines opened this morning.
Professor Brian Cox has been "roped in" to take part in the Monty Python reunion concert, Eric Idle said.
The star said he wanted Cox to join in on a performance of Galaxy Song from The Meaning of Life. Speaking after today's press conference, Mr Idle said:
"John can't do silly walks because he has a hip replacement, I decided I couldn't do the Travel Agent because you have to talk for 15 minutes and it's really exhausting and so I thought well I'd like to do some of the songs we've never done.
"I'd like to do Galaxy Song with Professor Brian Cox coming in. I was with him last night, talked him into it."
Monty Python star Michael Palin said he is most surprised by the size of the international fan base the show has garnered over the years.
Speaking to Nina Nannar, he said he said he was constantly asked to do his sketches in different languages and that he is not worried about forgetting any of the sketches, as the fans know them all better than him.
John Cleese said he is not feeling nervous about performing Monty Python at the O2 Arena next year as he expects the show to be "like a party" - a celebration of the classic sketches between the performers and fans.
He said he is excited to be reunited with his co-stars on stage, safe in the knowledge their material is "pretty funny".
Speaking to Nina Nannar, he dismissed reports the troupe were reuniting simply for the money and labelled the Daily Mail writers who made the claims "w*****s".
Monty Python member Terry Jones has said the idea to reunite with his fellow cast members was sparked by a suggestion from South Park's Matt Stone and Trey Parker.
Speaking after the press conference, he said: "They said 'wouldn't it be nice to do something together' and that got us thinking and so we thought about doing something together. We'd like to do something with Matt and Trey but we'd like to do something ourselves".
John Cleese says he hopes the touts don't make a killing from Python tickets as they fought to keep prices low.
Michael Palin tells me he can't quite remember all the lines from the classic Python sketches!
Terry Jones made my day by saying "he's not the Messiah, he's a very naughty boy" to my camera. Best line.