Miss Booth, who is Cherie Blair's half sister, decided to adopt her new faith after visiting the holy shrine of Fatima al-Masoumeh (peace be upon her) in the holy city of Qom, central Iran.

Hazrat-e Fatima al-Masoumeh is a sister of Imam Reza (peace be upon him) the 8th infallible Imam of shia Muslims whose holy shrine is located in the northeastern city of Mashhad.

The 43-year-old mother of two, who has long sympathized with the oppressed people in Palestine, described how she had a religious awakening six weeks ago on a visit to Hazrat-e Fatima al-Masoumeh's shrine in Qom.

'I sat down and felt this shot of spiritual morphine, just absolute bliss and joy,' she told the daily Mail.

'I always felt that the ummah [Muslim community] is a very loving, peaceful place and I am proud to be a member of it,' she said.
She now covers her head with a hijab when she leaves home, has given up alcohol and visits a mosque 'when she can'.

Miss Booth, also a journalist and human rights campaigner, has stopped eating pork, reads the holy Qur'an every day and has not ruled out wearing a burka in the future.

'I also haven't had a drink in 45 days, the longest period in 25 years,' she said. 'The strange thing is that since I decided to convert I haven't wanted to touch alcohol, and I was someone who craved a glass of wine or two at the end of a day.'

She announced her conversion at the Global Peace and Unity Event in London on Saturday. To cheers, she said: 'What I wanted to share with you today is that I am Lauren Booth and I am a Muslim.'

Miss Booth was a vocal opponent of the Iraq war and recently criticised Tony Blair for exercising bias in favor of Israel.

In a letter to former prime minister, she said: 'Your world view is that Muslims, are mad, bad, dangerous to know. A contagion to be contained.'

Booth has been attending several occasions of the International Quds Day rallies in Tehran. The International Quds Day was founded by the late Imam Khomeini, the founding father of the Islamic Republic of Iran to highlight the plight the oppressed Palestinian nation is enduring under the Israeli occupation. The late Imam Khomeini named the last Friday of each fasting month of Ramadan as the International Quds Day.

After attending the most recent Quds Day rally in Tehran, she called the occasion Blair's "worst nightmare," saying the rallies were propelled by the Muslim nation's high awareness of "the history of this region, the wrongs perpetrated by Israel against Palestine and the political machinations of the US and the UK governments to isolate them."

Lauren Booth works with Press TV, the English language Iranian TV channel, where she has contributed to several programs including “Between The Headlines”, “Remember The Children of Palestine”, “Vote Who?” and a number of other programs.

Booth wrote to Blair, "Well here again Tony, you've been fed and have consumed in its entirety, a massive lie. The lie that says when Muslims express an opinion in groups, in public, it is always spurred on by hatred of 'us' infidels."

"Today when the streets of London reverberate with cries of 'Allahuakbar! [God is the Greatest]' and 'Down Down Israel.' Christians and Jews will join the thunderous cries of 'Down Down Israel,' marching shoulder to shoulder with the 'political' Muslims you say you fear so much," she said.

"It's kind of like the way you express solidarity with America only without illegal chemical weapons and a million civilian deaths."

"It's worth its weight in WMDs (weapons of mass destruction)," Booth wrote about Tony Blair's memoir.

Under Blair, Britain joined the United States to invade Iraq, while attempting to convince the international community that the violence-ravaged country was in possession of the arms. Later findings, however, proved that not only Iraq did not have WMDs, but also that the officials who rallied support for the invasion had been informed about the nonexistence of such weapons.

Booth also addressed Blair's advocacy for Israel and his insistence on the Muslims' alleged animosity towards the Jews.
"The 'conflict' between Palestine and Israel is according to you all about religion and has nothing at all to do with the ethnic cleansing of the Arab population, nor the degradation of those who remain beneath the boots of their Israeli occupiers," she wrote.

"You say that Arabs have and always will see 'Jews' as enemies.

"For God's sake Tony do your history…Did your pals in Tel Aviv forget to tell you how many thousands of Jews lived in Historic Palestine in harmony with their Arab neighbors before 1948?," Booth said, referring to the year when Israel claimed existence on the back of the military occupation of vast expanses of Arab territories.

"Do you really not know that even today tens of thousands of Jews reside contentedly in Iran?", Booth asked Tony Blair.