Miranda Kerr and Orlando Bloom's son, Flynn, celebrated his fourth birthday as the former Victoria's Secret angel took to Instagram to show the scenes behind the party.Tom Cruise's rumored girlfriend also said that she maintains a "harmonious" relationship with her ex-husband.

The 31-year-old Wonderbra brand ambassador announced to her followers about her son's special day via her social media account. In an Instagram post, Miranda Kerr gave a peek at the scenes behind the birthday party of her son with Orlando Bloom as the model uploaded images of party decorations.

Her photo also included an adorable monkey party whistle with some tiny star and "happy birthday" confetti, The Daily Mail said.

"Today is my most favourite day #flynnsbirthday," Miranda Kerr said in her caption.

While Miranda Kerr and Orlando Bloom announced their divorce in 2013 after three years of being together, the Australian catwalk beauty and the "Hobbit" actor remained friends for the sake of their only son, News.com said.

Miranda Kerr once said to Elle Australia that their relationship is still important for the sake of their child.

"We're very good friends and this bonding is the most important thing, otherwise Flynn would feel it," Tom Cruise's rumored girlfriend said.

"We do everything to make sure our relationship is harmonious. We both love and care about each other and genuinely want each other to be happy," Miranda Kerr added.

It was also reported late last year that Miranda Kerr and Orlando Bloom celebrated the holidays together with their son.

The former Victoria's Secret angel previously said she is still single after her split with "The Lord of the Rings" actor but rumors claimed that she is dating "Mission Impossible" star Tom Cruise while other reports alleged she is seeing media mogul James Packer.

According to reports, Tom Cruise's interest in the catwalk beauty started when they met in November 2013.

But despite dating rumors, Miranda Kerr said that her priority is her son and career.