Um, but why does it look like he's about to grab her booty?! Guess these two couldn't wait until they got on the plane!

Justin Bieber and lady love Sofia Richie hopped on a private jet on Friday afternoon, and as they were boarding, the Biebs looked like he was going for a full on grope session. Maybe he wanted to make sure his lady love didn't fall? Sofia turned 18 on Wednesday (we're guessing Biebs is thrilled about this!), and after the two landed in Cabo, and she posted a Snapchat video of candles shaped like a heart. How romantic!

Though the two have been inseparable for most of the last month, there have been a few times were Sofia has been snapped out solo -- and Justin has been spotted with other girls. We're guessing Sofia doesn't like that very much, but she had to know what she was signing up for when she started romancing the pop phenom! Of course, Biebs DID delete his Instagram page two weeks ago after commenters started leaving nasty remarks about his love life, so perhaps that was his way of showing his dedication to Sofia?

"I'm gonna make my Instagram private if you guys don't stop the hate," Biebs wrote earlier this month. "This is getting out of hand, if you guys are really fans you wouldn't be so mean to people that I like." Of course, ex Selena Gomez felt it necessary to weigh in, and wrote, "If you can't handle the hate then stop posting pictures of your girlfriend lol — it should be special between you two only. Don't be mad at your fans. They love you. They were there for you before anyone." Biebs replied, "It's funny to see people that used me for attention and still try to point the finger this way. Sad. All love." Burn! Gomez responded, "Funny how the ones that cheated multiple times, are pointing the finger at the ones that were forgiving and supportive, no wonder fans are mad. Sad. All love." Bieber wrapped things up with one final comment -- and then deleted his account. "I cheated," he wrote. "Oh I forgot about You and Zayn?"