SINGAPORE - Madam Halimah Yacob was on Thursday (Sept 14) inaugurated as Singapore's eighth president.

During the ceremony at the Istana, Madam Halimah inspected a guard of honour, took her oath of office and gave her first address as president.

Prime Minister Lee Hsien Loong, Deputy Prime Minister Teo Chee Hean and other MPs and members of the Cabinet later shared photos and messages on social media marking the historic occasion.

Here's a look at some of them:

1. President Halimah's life story reminds us that the Singapore Story is one of hope and opportunity: PM Lee

Prime Minister Lee Hsien Loong on Thursday (Sept 14) night said President Halimah Yacob's swearing-in ceremony "is a significant moment in our history".

"On 9 August 1965, at the moment of our independence, Mr Lee Kuan Yew pledged that this would not be a Malay nation, a Chinese nation, nor an Indian nation. Everybody would have his place, equal, regardless of language, culture, religion. Today, we reaffirmed that pledge," he wrote.

He said Singapore's president is the "unifying figure of our nation and represents all Singaporeans".

"I am confident that Madam Halimah will fit into this new role, and perform it with distinction," he wrote.

2. Special feeling to sing National Anthem with Halimah: Teo Chee Hean

"With so much racial and religious conflict even in our own region, it takes special efforts and measures to keep Singapore peaceful and harmonious," he wrote.

3. Law Minister K. Shanmugam shares multiracial shot, 'representation of Singapore'

Law Minister K. Shanmugam shared a photo of Madam Halimah, PM Lee and Chief Justice Sundaresh Menon at the swearing-in ceremony, writing succinctly: "Malay President, Chinese Prime Minister and Indian Chief Justice. Representation of Singapore."

4. We are not yet at our final destination: Vivian Balakrishnan

Minister for Foreign Affairs Vivian Balakrishnan said a harmonious multiracial country is always a work in progress.

"We are not yet at our final destination. But it is still worth celebrating how far we have come, together," he wrote.

"I wish President Halimah Yacob all the very best as she leads us all on this phase of our journey."

5. She exemplifies the nation's virtues: Ng Chee Meng

Education Minister (Schools) Ng Chee Meng congratulated President Halimah Yacob on her presidency, saying she "exemplifies many of our nation's virtues in her life and service to Singapore".

6. Amrin Amin 'honoured to witness history'

Sembawang GRC MP Amrin Amin shared a photo of the swearing-in ceremony and captioned it: "Living history".

He said he was honoured to witness history "at the swearing-in of Singapore's eighth President, Singapore's first female President and first Malay President after 47 years".

Chua Chu Kang GRC MP Zaqy Mohamad shared similar sentiments.

7. Baey Yam Keng shares wefie

Tampines GRC MP Baey Yam Keng was one of the first to post photos online - sharing a wefie from inside the Istana at 6pm, just before the ceremony began.

His photo included Workers' Party chief Low Thia Khiang, East Coast GRC MP Jessica Tan, Tanjong Pagar GRC MP Chia Shi-Lu, Jurong GRC MP Ang Wei Neng, and Ang Mo Kio GRC MP Gan Thiam Poh.

He also shared his "best wishes to President Halimah".

"I used to sit next to her at official events when we were backbenchers," he wrote. "Despite her strong dedication to her work and the dignity she carries with her in her official capacity, she is also someone who can engage in small talk and relate to people well."

8. Pritam Singh posts Workers' Party team photos

Aljunied GRC MP Pritam Singh shared photos of himself with his Workers' Party team at the Istana.

He was with party chief Low Thia Khiang, party chairman Sylvia Lim, and Non-Constituency Members of Parliament Dennis Tan and Daniel Goh.

9. Tin Pei Ling's girl power photo

MacPherson MP Tin Pei Ling shared a group photo of several women in Cabinet, taken with President Halimah and former president Tony Tan Keng Yam and his wife.

The photo included Sylvia Lim, Jessica Tan and Minister for Culture, Community and Youth Grace Fu.

Former president Tony Tan and his wife were also pictured.

10. One thing I know, she's authentic, says Denise Phua

Central Singapore District Mayor Denise Phua shared a photo of herself with President Halimah, her husband Mohamed Abdullah Alhabshee and Nominated Member of Parliament Chia Yong Yong .

She wrote: "One thing I know, she's authentic and will care for those at risk of being left behind. #mypresidentcares"