Michael Phelps is expecting a second child

Olympic swimmer Michael Phelps and his wife Nicole are expecting their second child.

The couple announced the news with matching social media posts on Tuesday, and the heartwarming photo sees Nicole holding their one-year-old son Boomer — who has her pregnancy test in his hand. 

‘Number 2 on the way!!!! So excited!! Wonder if it’s a boy or a girl??’ 32-year-old Michael captioned the image. 

Surprise! Michael Phelps and his wife Nicole revealed that they are expecting their second child by sharing a photo of their one-year-old son Boomer holding her positive pregnancy test 

Good question: When sharing the photo on Instagram, the Olympic swimmer questioned if the child is a boy or a girl

Good question: When sharing the photo on Instagram, the Olympic swimmer questioned if the child is a boy or a girl

Proud mom: Nicole shared the same photo on her Instagram page, noting that Boomer is going to be a 'big brother'

Proud mom: Nicole shared the same photo on her Instagram page, noting that Boomer is going to be a ‘big brother’

Nicole is grinning from ear to ear as she cuddles her baby boy in the snapshot, which was taken in their back yard.  

The expectant mom is dressed casually in cutoff denim shorts and a black tank top, while Boomer looks adorable in colorful, striped T-shirt.  

Sharing the same image, Nicole, 32, added: ‘Lil mans going to be a Big Brother!!!’

The growing family is clearly thrilled with the news, and the couple also posted an announcement on Boomer’s Instagram page, which has over 795,000 followers. 

Boomer looks ecstatic to be a big brother, and in the photo he his happily clapping as his mother shows him her positive pregnancy test.  

Too cute: The parents also posted an announcement on Boomer's Instagram account, which has over 795,000 followers 

Too cute: The parents also posted an announcement on Boomer’s Instagram account, which has over 795,000 followers 

Soon-to-be big brother: 'Do I get to have a brother or sister?' they captioned the image of Boomer clapping as his mom shows him her positive pregnancy test

Soon-to-be big brother: ‘Do I get to have a brother or sister?’ they captioned the image of Boomer clapping as his mom shows him her positive pregnancy test

Love: Michael recently revealed that he and Nicole wanted to have more children together. They are pictured last month celebrating the 10-year anniversary of their first meeting

Love: Michael recently revealed that he and Nicole wanted to have more children together. They are pictured last month celebrating the 10-year anniversary of their first meeting

A daughter on the way? The Olympic swimmer said is wife had brought up wanting to have a baby girl 

A daughter on the way? The Olympic swimmer said is wife had brought up wanting to have a baby girl 

‘So excited to see what mama is having!! Do I get to have a brother or a sister?!?’ the picture is captioned. 

Thousands of fans have liked the heartwarming images, with many taking to the comments sections of the posts to congratulate Michael and Nicole. 

‘Now they have enough members for a family relay,’ one person joked. 

A few months ago Michael revealed to People that Nicole recently brought up that she would like a baby girl.  

‘We definitely want more kids, it just depends on when,’ he said. ‘I’m sure I’m getting pressure.’ 

Doting dad: The couple welcomed Boomer into the world on on May 5, 2016, and the two have proudly documented their little boy's every move on Instagram 

Doting dad: The couple welcomed Boomer into the world on on May 5, 2016, and the two have proudly documented their little boy’s every move on Instagram 

Bonding time: Michael enjoyed a beach day with his son in July 

Bonding time: Michael enjoyed a beach day with his son in July 

Celebration: Thousands of people have congratuled Michael and his wife on Instagram. They are pictured at the Nickelodeon Kids' Choice Sports Awards last month

Celebration: Thousands of people have congratuled Michael and his wife on Instagram. They are pictured at the Nickelodeon Kids’ Choice Sports Awards last month

After a surprise pregnancy, the couple welcomed Boomer into the world on on May 5, 2016, and the two have proudly documented their little boy’s every move on his Instagram account.  

Nicole, who was crowned Miss California USA in 2010, began dating Phelps in 2009, though in 2012 the couple briefly split. 

They secretly married in June 2016, and less than two months later the family headed to Rio de Janeiro to cheer on Michael as he competed in his fifth Summer Olympics.

There, he brought home a impressive five gold medals and one silver and was also selected to carry the United States flag during the opening ceremony.

Just a few days after the news of their secret nuptials broke, the two walked down the aisle for a second time last October during their formal second wedding in Cabo.

Read more at DailyMail.co.uk