Yes, I'd type Adam Lambert as 4w3 (SX/SP). I find he is most obviously Type 4, more obviously so than Victoria.
Just... look at him, trying really hard to be unique.
(But in a w3 and Synflow way that is still "marketable", aka "edgy, but in a good/acceptable way".)
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Also, his song "Whataya Want From Me" is pretty much about a Sexual Type 4 who is caught up in their own negative emotional spiral, having difficulties coming out of a numbing depression, while still somehow loving the other person and asking for forgiveness.
A Type 3 would never be as emotionally open and vulnerable to the public (even as an artist) – Type 3s are actually afraid of showing and acknowledging their "darker, deeper" emotions, because it might make them look less like the shining successful person they want to be seen as. Depression is a sign of being a failure to a Type 3 – you cannot market yourself well with a depressive attitude. Adam Lambert is not afraid of bringing those negative emotions outwards at all, it is actually a part of his image. 3w4 will never be as comfortable with their darker emotions, even though they may be somewhat in touch with them (much more than 3w2), but they will be so mostly in secret, and only their closed loved ones would know.
Why do you think I am 4w3?