Victoria Beckham landed at Los Angeles International Airport with daughter Harper and her sons Cruz and Romeo on Thursday evening, and the group looked exhausted after jetting in from London!

But Victoria had previously flown to London from South Africa, so we have a feeling she was running on hardly any sleep at all. You'd never know though -- as usual, she looks absolutely amazing! Victoria's hubby David flew home a few hours earlier, and it appears as though their oldest son Brooklyn was staying stateside during this time, as he wasn't with either parent.

The former Spice Girl headed to Soweto, South Africa for her first trip as a United Nations ambassador last week, and she met with mothers and babies who are suffering from HIV. Victoria stopped by Bara Hospital, where she spent time with community workers from Anova Health Institute.

Last month it was announced that the British star would be an ambassador for the UNAIDS campaign, and at the press conference in New York City, Posh told the audience, "I am mother and I am a woman. I will do whatever I can to raise awareness. I feel very passionate about this. I recently visited South Africa and was so touched by the women I met and felt inspired. I came home and I knew I had to do something."

Victoria posted the below photo and wrote, "In the last 3 years @ejaf have helped over 60,000 mothers give birth to HIV free babies. X vb."