As Zayn Malik turned big 21 over the weekend, his fellow One Direction bandmate Liam Payne joined him on the birthday celebration.

Evident in a series of photos that were posted on social media, Payne seemed like he was having way too much fun -- to the point that he was completely ignoring his girlfriend Sophia Smith, who was reportedly present at the B-day bash as well, and ditched her for the rest of the night. Smith was nowhere in sight with the "Best Song Ever" singer.

"When @blitzstyles met Liam tonight and said that he was super drunk and ignoring Sophia -L," @1DAlwaysUpdated wrote on Twitter.

Later on, Payne took Twitter to thank Malik for hosing him and his friends at his birthday party. "@zaynmalik happy birthday bro have a good one tomorrow thanks for having us sorry haven't got ur num in this phone so had to say it here."

One of Liam Payne's friends also tweeted about their wild night. "Tonight is going to be a big night!!" while the other one wrote, "As if I'm smashed in Zaynes house."

Another friend added by revealing some antics that occurred that night, "LOL as if we've just jumped Zane's fence to his house o.0"

The video of Payne partying at his favorite spot in London, Funky Buddha, was posted, hinting that he and his crew ended up hitting up the clubs in the night.

In addition, he recently revealed about an older girlfriend he once had.

"I had a girlfriend called Chanelle in reception, who used to send me love letters," said Payne. "I was also really proud of the fact that I went out with a girl who was in Year Six when I was in Year Four. She was one of my sister's friends, and I thought I was really cool having an older girlfriend."