Britain's Prince William and his wife Catherine, Duchess of Cambridge, appear with their baby daughter, Charlotte Elizabeth Diana, outside St. Mary's Hospital in London, May 2, 2015. Reuters/Cathal McNaughton

Gifts for the newest royal baby Princess Charlotte are still pouring in. The latest of them are pink boots that Prince William received during the Audi Polo Challenge on Sunday.

The Duke of Cambridge received the Wellington boots, or "wellies," during the second day of the polo event, states People magazine. The tiny boots were a gift from Andre Konsbruck, director of Audi UK.

For the past four weeks since the birth of Princess Charlotte, Prince William and Kate have been receiving various gifts from friends and family, such as a Tasmanian merino wool blanket from Australia, an embroidered dress from the Israeli president and a personalized jersey from England’s women’s soccer team.

Prince William also competed in a polo match Sunday, joining Team Ultra, alongside his brother Prince Harry. The star-studded event was attended not only by English dignitaries but by a few Hollywood celebrities as well.

The two royals were seen talking with Chris Hemsworth, his wife Elsa Pataky and their 3-year-old daughter India Rose. Pataky even shared a selfie on Instagram on Monday, captioning it: "Enjoying a polo match in Ascot! #audipolochallenge #ulyana #familymoments #lovehorses," reports E! News.

Prince William also met "12 Years a Slave" actor Chiwetel Ejiofor, while Prince Harry was seen having an enjoyable chat with Samuel L. Jackson. The star of "The Avengers" star also posted a picture of himself with Prince Harry, writing: “BTW, HRH Prince Harry was on the winning team! Met him years ago at St Andrews, good kid then, good Man now!”

Meanwhile, Prince William will be heading back to work Monday as an air ambulance pilot after taking a break to take care of new baby Princess Charlotte and his wife Kate. The Mirror reported that William took unpaid leave in April after the first phase of his training with East Anglian Air Ambulance.

Since the birth of Princess Charlotte early last month, he and wife Kate has been taking care of the new baby and Prince George at their country estate, Anmer Hall. While William has attended a few royal engagements since the birth of his daughter, his return to work Monday marks the end of an almost six-week break from his flying duties.