Catherine, Duchess of Cambridge, Kate Middleton

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It's Kate Middleton's birthday, which means a royally huge, blowout party is going down, right?! Mmmm, not so much.

Although it is the Duchess of Cambridge's big day, she and her loved ones opted for a low-key celebration. And when we say low-key, we mean low-key.

"Unfortunately it seems [Prince] William was tired after his full day at Cambridge. They've stayed in and are having a meal at Kensington Palace. [Prince] Harry is with them," a source exclusively tells E! News.

"Carole [Middleton] was spotted at lunch time picking up food from Whole Foods. Then she went back to Kensington Palace, so Carole is with them, too."

E! News learned yesterday that Carole would be by her daughter's side on her 32nd birthday, and we were also told that mother Middleton spent some time shopping at Kate's favorite brands.

A source tells E! News, "Carole came into London from Bucklebury for a shopping spree on the Kings Road…She spent about an hour and a half in Peter Jones where she was browsing and purchasing items from the Lancôme counter."

Sounds like someone was buying a couple gifts.

Prince William

REX USA/Geoffrey Robinson/Rex

Prince William, on the other hand, had yet another long day at school after beginning his 10-week program at the University of Cambridge on Tuesday. Wills was spotted rushing to grab the train after his class today to make sure he got back to his ladylove in time for her birthday celebration.

"It was just before 5 p.m., William spent all day studying and then ran onto the station platform just in time to get the train. He was obviously eager to get that one rather than wait for a later one," a source tells E! News.

Kensington Palace announced on Dec. 30 that William would partake in a course in agricultural management organized by the Cambridge Programme for Sustainability Leadership.

At least Kate is surrounded by the people that matter most. That's what counts.

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