Nadia Lim shares relief after 'lovely couple' Topher Richwhite and Bridget Thackwray freed from Iran

Celebrity chef Nadia Lim says she is relieved to hear rich-lister Topher Richwhite and his wife Bridget Thackwray have been freed from Iran.

The couple, who married on June 18 this year, were detained by authorities after entering Iran as part of a tour around the world. 

They had been documenting their adventures on social media, but in July after they had arrived in the country, posts stopped, prompting concerns for their safety.

Speaking on AM, Lim said it was "really good news to hear" of their release.

"I last caught up with Bridget and Topher before they got married, and they're a lovely couple," Lim said.

"They've really been trying to explore and kind of philosophically work out the world and we had such great conversations about their travels and everything.

"I'm so glad to hear that they're now safe, thank goodness 'cos how scary, really good news to hear." 

They had been going around the world in their Jeep nicknamed Gunther as part of a journey called 'Expedition Earth'.

The pair was detained for up to 14 weeks in Iran as a wave of protests against the oppressive regime began.

A Ministry of Foreign Affairs and Trade spokesperson told Newhsub on Wednesday the couple is now "safe and well". 

Travel advice for Iran has been updated by MFAT.

"The new advice for Iran reiterates the existing 'Do Not Travel' warning, and adds that due to the potential for violent civil unrest, the risk of arrest or detention and the volatile security situation in the region, the risk to safety in Iran is significant," said Foreign Affairs Minister Nanaia Mahuta.