Prince Harry “warned” King Charles II about what he could buy Princess Lilibet for her second birthday, a new report claims.

The Duke of Sussex reportedly told his father that his planned gift — “custom-made cubby houses” — was too “extravagant.”

“He wants to give Lili something she will use and be hers,” a source told OK! magazine.

“She’ll remember it forever — it’s going to be the ultimate surprise.”

But Harry, 38, who is in the middle of a massive lawsuit against Mirror Group Newspapers, put his foot down.

“Harry has warned Charles [however] to be less extravagant,” claimed the source.

It’s unclear what the newly crowned king ultimately bought for his youngest granddaughter.

What she didn’t get, however, was a public shoutout on social media from the royal family — which she received for her first birthday last year.

A royal source claimed that King Charles Queen Camilla wouldn’t share any official birthday wishes for little Lili online because they “don’t mark the birthdays of non-working members.”

“They, of course, wish Lilibet a very happy birthday, but nothing will be put out on any channels,” the source told OK! Magazine UK.

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Charles’ decision to snub Lili’s birthday strayed from how his late mother, Queen Elizabeth II, handled the tot’s big day.

The late monarch wished her great-granddaughter a happy 1st birthday in 2022, just months before she passed away in September at 96.

“????Wishing Lilibet a very Happy 1st Birthday!” Lili’s great-grandmother shared via her official social media account at the time.

While Lili didn’t get an Instagram post, Harry and wife Meghan Markle, 41, threw her an “all-American” birthday bash at their Montecito, Calif., estate last weekend.

The month before, the couple threw their son, Archie, an “intimate” party.