Paris Hilton surprised the world this week when she announced the arrival of her second child, a daughter named London.

Like her son Phoenix, who is almost 11 months old, her new daughter was conceived via surrogate.

The Hottie or Nottie star, 42, shared an adorable video on TikTok of the moment she and her husband Carter Reum, also 42, told Phoenix he was going to be a big brother.

The mom of two sat next to her toddler on the couch while dad filmed the interaction.

Phoenix was alternately interested in what his dad was saying and otherwise absorbed by the iridescent and pink rolls of paper he was playing with.

Little sister: Paris Hilton, 42, shared an adorable video on TikTok of the moment she and husband Carter Reum, also 42, told son Phoenix, 10 months, that he was going to be a big brother

Big brother: Paris surprised the world this week when she announced the arrival of her second child, a daughter named London. Seen with Carter — whom she married in 2021 — on November 4

The voiceover said: ‘Phoenix, we’re about to surprise everyone and tell them that you have a sister.’

It continued: ‘Wow. They’re going to fall out of their chairs. Isn’t it exciting?’

Phoenix seemed nonplussed by the news as he continued to play with the holographic paper.

‘I love you kid,’ Reum continued. ‘Remember, the only rule of the Cutesie Crew is that we all have to be good human beings. Deal?’

Phoenix looked up at his dad with rapt attention.

‘And if so we get to play with pink and holographic stuff all day long,’ he concluded.

Paris said ‘Yay,’ as if she was voicing her son’s inner thoughts.

Paris and Carter announced the arrival of their daughter London on Thanksgiving.

She shared the happy news by posting a pink baby outfit with the name London – thereby revealing the sex and name of her little one.

‘Thankful for my baby girl,’ the heiress wrote in the caption of the image.

Sibling: Like her son Phoenix, Paris’ new daughter was conceived via surrogate

Family: The mom of two sat next to her toddler on the couch while dad filmed the interaction

Play time: Phoenix was alternately interested in what his dad was saying and otherwise absorbed by the iridescent and pink rolls of paper he was playing with

Exciting: The voiceover said: ‘Phoenix, we’re about to surprise everyone and tell them that you have a sister.’ It continued: ‘Wow. They’re going to fall out of their chairs. Isn’t it exciting?’

While the news of her second child’s arrival has come as a surprise, the name itself does not.

Hilton opened up in a live chat episode of her podcast I Am Paris on March 1 that she had picked out the name London if she ever had a daughter.

‘I’m really excited for Phoenix to have a baby sister one day—named London. It’s my favorite city and I’ve always wanted to name my daughter London,’ she said.

‘I had actually picked that name for a long time now, probably over 10 years. I always wanted London. I love that name for my daughter,’ she added.