Miley Cyrus and Patrick Schwarzenegger’s relationship is “adorable”.

Patrick’s sister Katherine spoke about her sibling’s romance with the Wrecking Ball singer during an interview on US TV show Extra on Thursday.

Miley and Patrick started dating in November last year, and appear to be happier than ever.

Calling the pair “adorable”, Katherine added: “You just want your sibling to be happy. If they’re with someone who makes them happy and in a happy, healthy relationship then I’m happy.”

Both Miley, 22, and Patrick, 21, frequently post pictures flaunting their love on Instagram and Twitter.

And when their busy lives keep them apart, Katherine knows she can always be safe in the knowledge that she can catch up on her family on social networks.

“Everyone in my family is super active on social media, it’s great,” Katherine said. “I get to see where everyone is all the time since we’re all scattered now… Some people in my family tend to tweet things or Instagram things and make me laugh. It’s all good, it’s fun.”

Patrick and 25-year-old Katherine are the children of Arnold Schwarzenegger and his ex-wife Maria Shriver. Katherine added to Extra host Mario Lopez that Maria has a very strict set of rules when it comes to using phones during dinner.

“She makes us put our phones in the centre of the table so no one is on them,” she said.

Despite claims that Maria was initially disapproving of Patrick’s relationship with Miley, it seems she may have changed her mind.

The 59-year-old was seen heading out to dinner with her son and his girlfriend at Palm Restaurant in Los Angeles on March 11.

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