Victoria Beckham & Louise Adams
Posh and her younger sis may have spent more quality time when Louise was reportedly babysitting the Beckham brood during the Spice Girls reunion tour, but the two still see each other during layovers in London or when Louise visits the famous fam in L.A.
Lauren & Breanna Conrad
L.C.'s little sis got a taste of the limelight when she starred in the third season of Laguna Beach, but fame must have left a bitter taste in her mouth because Lauren's sister has since dropped out of sight. Smart girl, no?
Britney Spears & Bryan Spears
The 31-year-old brother of both the pop star and new mom Jamie Lynn may not share the glaring spotlight with his more famous siblings, but he’s definitely involved in their lives and careers. He was a co-executive producer on Jamie Lynn’s Zoey 101, and he is presently the cotrustee of Brit’s assets.
The Jonas Brothers & Frankie Jonas
His brothers Nick, Joe and Kevin might be burnin’ up the charts, but their little sibling could eventually give them a run for their money. After all, at just 7 years old, he’s not only put together his own band but has already built an honorary following among Jonas fans, who affectionately refer to him as the "bonus Jonas."
Rihanna & Rajad Fenty
It remains to be seen whether the Grammy winner’s little brother plans on following in her footsteps, but it certainly looks like she’d be willing to take him under her umbrella...ella...ella.
Penélope Cruz & Monica Cruz
One may be globally known, earned an Academy Award nomination and dated the likes of Tom Cruise and Matthew McConaughey, but the other still has a leg up, so to speak, on her sister. For seven years, Monica was a member of the dance company led by Joaquin Cortes, one of Madrid’s preeminent choreographers.
Hayden Panettiere & Jansen Panettiere
Yes, big sis may get all the attention playing an indestructible cheerleader, but with several TV guest stints and a ton of voice work, her 13-year-old bro is starting to show signs of a potentially powerful career as well.
Sienna Miller & Savannah Miller
While the scandal-prone star spent much of her time recently gallivanting topless, her fashion designer sister was quietly finding ways to keep folks covered up. Next time, perhaps, the actress would be wise to go out and about wearing something from the clothing line she and her sibling created together.
Ashley Tisdale & Jennifer Tisdale
HSM's Sharpay Evans would totally feel threatened if her older sibling were also a thespian, but her alter ego clearly isn’t. The Tiz and her sister have a very close relationship—one that even led to Jennifer making an appearance on Ashley’s show, The Suite Life of Zack & Cody.
Nicole Kidman & Antonia Kidman
Sure, the Oscar winner may be more recognizable, but if you ask us, her younger sis is just as bewitching. In fact, this mother of four has used her Kidman cuteness to host several entertainment-related TV shows in her native Australia.
Miley Cyrus & Brandi Cyrus
The Hannah Montana star may be ridiculously popular, but there can be downsides to life in the spotlight. While her maternal half-sister might not be nearly as well-known—despite a few acting gigs—there's probably something to be said for building a career without everyone watching. That sounds more like the best of both worlds.