Justin Bieber Fans Have the Best Reactions to His First No. 1 Single

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Justin Bieber performs during the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. 

It's a big day for Justin Bieber -- and his fans are loving it.

In addition to getting his first No. 1 on the Billboard Hot 100 with "What Do You Mean?," he's also the youngest solo male artist to debut on the top of the chart and only the 21st artist to ever bow up top.

Justin Bieber Scores First Hot 100 No. 1 With 'What Do You Mean?' Debut

Beliebers are celebrating their boy's big news the best way they know how: by posting celebratory memes on Twitter with the hashtag #BieberIsBack. Check out some of our favorites below: