The GAA training marks the end of William and Kate's trip to Ireland, and they will return to the United Kingdom later today- but Kate was heard telling a young Galwegian that she loved her time in Galway and would be back, this time with the kids.
For Jennifer, this is certainly not the first time a famous face has wanted to have their picture taken with her.
This isn't Jennifer's first celebrity encounter - or the first time Prince William broke the Queen's rule not to take selfies.
William was not the photographer for the rogue selfie, in case you were wondering.
Jackman shared the photo on social media with the caption: "Hi Jennifer". "Very good of Jennifer to oblige him with a selfie!" wrote one.
A third wrote: "Jennifer you must be one wonderful and lovely young lady".
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Both Will and Kate struggled with the concept of soloing the ball - volleying the ball back up to yourself while running - but both heartily took part in the drill.
Scroll down to see all of the best photos from the Duke and Duchess's global trip.
Prince William and Catherine are parents to three children.
The start of the Duke and Duchess of Cambridge's final day in Ireland has been delayed after bad weather affected their flight arrangements, an Irish Government spokesman has said. "It has been so interesting hearing all the storytelling over the last couple of days".
The Duchess of Cambridge endeared herself to those keeping up with her trip by sipping a Guinness, trying her hand at hurling and Gaelic football, and even got involved in a trad session.
The service at Westminster Abbey will be broadcast on BBC One and and across the world. After Mooney explained his thoughts on the matter, Prince William continued a series of coronavirus-related jokes.